I was hoping we'd hear from someone who had a different opinion! I see where you're coming from. I'm the type of person who lives to diversify their island- I like diverse personalities, diverse species, diverse flora, diverse themes, etc. But I know some people are really sticking to certain themes and stuff.I kind of like that the wood you get is random, and I don't mind having excess. It's not too much work to sell it or to craft it into something. I wouldn't like having specific trees because I just know I'd be so focused on trying to have the exact right number of trees to suit my needs, but have to worry about how to place the trees so they look nice but random at the same time....
But... like, I feel when you're really sticking to certain themes, you often have to give stuff up- like those who don't want a certain personality lose the ability to learn certain reactions.
Maybe if they changed it, but then made the Nook Miles islands more diverse- like give us some packed with palm trees, packed with cedar, etc. It'd give people an opportunity to get the kinds of wood their island may be lacking without affecting their island's appearance.