We use "would" when we want to express our opinions, https://www.collinsdictionary.com/dictionary/english/would:
I think you'd agree he's a very respected columnist.
I would class her among/with the top ten American novelists. (mine)
We would describe the standard of the food as poor. (mine)
I would call it self-defense. (mine)
Q: Can we replace "would" with "might" or "could" in these examples? In other words, can we use "might" or "could" with this "opinion meaning" of "would"?