Losing your grenade ability bricks so many builds that I'm surprised it was even a consideration for the preset modifiers in quickplay. It's good for speed and certain traversals, but that's about it.
Any modifier that straight up replaces an entire ability should never be part of the generic quickplay playlists.
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How to make an already annoying season worse. Bungie Meeting: "Hey guys, how about this idea? Let's make grenade builds totally useless in a matchmade activity! On top of that, let's make a daily require said matchmade activity! They will love that playstyle! Especially if it falls on the only day they have that week to play because they have a real life."