All JWs are not the same, but when I was young in the 1980s I reckon about 90% of JWs liked a good discussion. Now I think it’s flipped the other way, and about 90% of JWs avoid serious discussions like the plague. In some cases it’s the same JWs who once liked a good discussion, but now can’t face it. I think changes like the “overlapping” generation has knocked their confidence. Many JWs know the game is up, at least on some level, so they don’t have the stomach for serious discussion, because they don’t have confidence they can hold their ground.
I think JWs could certainly accept evolution at least with respect to animals, plants and other life, and insist that humans alone were a direct creation by God. This is apparently what Russell taught, so it is compatible with their view of the ransom and salvation.