Dropping old features and adding in new features is perfectly fine. The new features are worth spotlighting, and jesus fuck, can you imagine if they refused to drop old features? Try playing a pokemon game with:
a radio, trainer calls, your mom saving your money, room decoration, secret bases, two bikes, dexnav, amie minigames, poketch, contests, pokathelons, poffin blending, seals, the underground, trainer customization, seasons, following pokemon, mirage islands, eon flute flying, swarms, SOS battles, hordes, hidden grottos, 5 battle facilities, apricorns, join avenue, ultra warp ride, (a variant of) island scan, super training, poke pelago, HMs, pokeride, and whatever the hell gen 8 adds.
Sounds bloated as fuck, and hell, I've probably forgotten some things.