Well, the apps often come bundled with a bunch of other stuff. Automatic updates, background workers, telemetry …

All of which sucks up your compute resources and battery. Repeat for every such little utility app you have on your Mac. Some may implement that random stuff inefficiently (eg very frequent telemetry), which sucks even more. Some of it may even be wrong, vibe coded, or copy pasted.

Personally, puts me off installing random utility apps, even if the single utility would be useful.