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It would break the game, if protect did not change. Imagine substitute/leech seed/leftovers stalling, with 2 more moves PLUS protect. Hell, everything that runs sub would just use protect every few turns to maximize leftovers recovery. It would be a complete slog. Ingame would likewise be tedious to a frustrating degree, having to wait for something to protect every battle before steamrolling.
Not to mention doubles would be even more of a shitshow