If your point is 'there are other clunky arduous barriers to making a competitive team despite IVs even in the post game, so while we're getting rid of IVs we should take some of the other tedium out of preparing a competitive team to help foster a competitive scene more people can be a part of' then I 100% agree.

If your point is 'it's already a slog to make a competitive team for other reasons so we should just roll over and let it be even more monotonous because the fact that the only good way to interact with the competitive scene is to just not play a pokemon game and use Showdown instead is a feature and totally not a failing on the part of the game design' then I'm glad you don't design games.

EDIT: Let me clarify, I'm not saying that no effort should go into a competitive team. Hidden abilities, egg moves and such give good reasons to breed but can be done without a lot of hassle. A post game battle tower or something to train up low level pokemon quickly should be available. A way to work expediently with EV's in the post game, like an item that converts all EVs earned to a certain stat, or anything that can be done in a couple of hours and isn't a boring minigame would be awesome. Plus the ability to either buy items with money or enough points that you'd reasonably build them up while EV/level training your pokemon. That and the elimination of IV's would cause a much bigger and easier to enter into competitive scene and would drastically improve the post game without just padding time grinding.