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The autist in me wishes Wind type was real just because Fire, Water and Ground/Rock get to be. But I’d never wish it to get added now. Most of these retypings are a stretch.
Had it been there from the start, I feel like Flying and the ability Levitate wouldn’t exist, and would instead be some different type of distinction in the stats. All Pokémon can fall into either grounded or flying subclasses outside of their typings. Maybe some are designed around switching between the two, like how Roost does. Either way, more bird Pokémon are able to exist without having to be automatically Flying types, and more Wind-themed Pokémon are allowed to exist that aren’t necessarily winged. Jumpluff and Drifblim being good examples that already exist.