Actually "since"'since' and "from"'from' are kind of similar though they have a difference in meaning, along with a distinct taste separating them. That means sometimesSometimes a language is not about why this and why not that, it's about which one is soundingsounds better in that particular case.
But in this case, they also have a difference in meaning, "since". 'Since' is used whenever the case hadhas started and it'sis still in aan intermediate period. So it's the time between two particular incidents or times. However "from", 'from' is used for strict identification of time or place, it. It doesn't give you the intermediate essencesense or meaning of the sentence'since'.