It still frustrates me that they did not do this with the introduction of the fairy type in gen 6. Even if it was just a resistance to water or something ice is super effective against would help wonders for the type.It does seem odd that instead of improving Ice types they seem to focus more on just not making many of them. Giving them at least one resistance besides Ice would go a long way, as would making Hail do something for their stats the way Sandstorm does for Rock types, etc. Aurora Veil was a nice idea as using it requires at least one Ice type on the team, but all it really did was give people reason to use Alolan Ninetales rather than helping Ice types overall.
More cross gen evolutions would be welcome as well, even if with every gen they seem more unlikely.
I too am in favor of more cross-gen evos and prevos again. It's funny, as time goes on I look back nostalgically at gen 4 and miss the attention to older mons - alolan forms and megas helped, but I feel some that received megas should've just gotten a permanent evolution.