10th edition is a result of all the constant complaints about 9th edition and the demand for a reset. In regards to preset terrain you don’t have to use it if the people you play agree to it.
This is typical for the design team, they pretty much always overreact when handing out the nerfhammer. It wouldn’t surprise me if they have someone dedicated in the design team that does this sort of thing.
Personally I’d love to see either new supplements or a codex. The current detachment rules are quite bland in my opinion and I’d love to see them spiced up.