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For decades, we’ve been unable to achieve localized production of materials, parts and equipment and the diversification of their import sources in some areas. However, just 100 days after relevant measures were taken, tangible and meaningful results are beginning to emerge.

Could you please explain why the writer chose the present perfect instead of the simple past tense?

As far as I know, the perfect present is used when the result of the perfect present is related with the present. But I can’t see the relation between the perfect present and the present in this sentence.

And doesn’t the sentence sound like the state being unable to achieve the localization continues even in the present? When I read only the first sentence itself, I was not sure whether the action continuesor not. Of course, after reading the second sentence we realized this present perfect is used as the completion of the action, but still, only with the first sentence, how can I know it? I’m not sure how to use the present perfect to clearly show the described action is finished.

Please help me, and sorry for many questions.

For decades, we’ve been unable to achieve localized production of materials, parts and equipment and the diversification of their import sources in some areas. However, just 100 days after relevant measures were taken, tangible and meaningful results are beginning to emerge.
_{Source: Address by President Moon Jae-in at National Assembly}

Could you please explain why the writer chose the present perfect instead of the simple past tense?

As far as I know, the perfect present is used when the result of the perfect present is related with the present. But I can’t see the relation between the perfect present and the present in this sentence.

And doesn’t the sentence sound like the state being unable to achieve the localization continues even in the present? When I read only the first sentence itself, I was not sure whether the action continuesor not. Of course, after reading the second sentence we realized this present perfect is used as the completion of the action, but still, only with the first sentence, how can I know it? I’m not sure how to use the present perfect to clearly show the described action is finished.

Please help me, and sorry for many questions.

For decades, we’ve been unable to achieve localized production of materials, parts and equipment and the diversification of their import sources in some areas. However, just 100 days after relevant measures were taken, tangible and meaningful results are beginning to emerge.

In the first sentence, can I use "we were unable to..." instead of the present perfect?

And could you please explain why the writer chose the present perfect instead of the simple past tense? As far as I know, the perfect present is used when the result of the perfect present is related with the present. But I can’t see the relation between the perfect present and the present in this sentence.

For decades, we’ve been unable to achieve localized production of materials, parts and equipment and the diversification of their import sources in some areas. However, just 100 days after relevant measures were taken, tangible and meaningful results are beginning to emerge.

Could you please explain why the writer chose the present perfect instead of the simple past tense?

As far as I know, the perfect present is used when the result of the perfect present is related with the present. But I can’t see the relation between the perfect present and the present in this sentence.

And doesn’t the sentence sound like the state being unable to achieve the localization continues even in the present? When I read only the first sentence itself, I was not sure whether the action continuesor not. Of course, after reading the second sentence we realized this present perfect is used as the completion of the action, but still, only with the first sentence, how can I know it? I’m not sure how to use the present perfect to clearly show the described action is finished.

Please help me, and sorry for many questions.

For decades, we’ve been unable to achieve localized production of materials, parts and equipment and the diversification of their import sources in some areas. However, just 100 days after relevant measures were taken, tangible and meaningful results are beginning to emerge.

In the first sentence, can I use "we were unable to..." instead of the present perfect?

And could you please explain why the writer chose the present perfect instead of the simple past tense?

For decades, we’ve been unable to achieve localized production of materials, parts and equipment and the diversification of their import sources in some areas. However, just 100 days after relevant measures were taken, tangible and meaningful results are beginning to emerge.

In the first sentence, can I use "we were unable to..." instead of the present perfect?

And could you please explain why the writer chose the present perfect instead of the simple past tense? As far as I know, the perfect present is used when the result of the perfect present is related with the present. But I can’t see the relation between the perfect present and the present in this sentence.