The issue isn't usage, it's waste. Every byte of RAM that's used unnecessarily because of bloated software frameworks used by lazy devs (devs who make the same arguments you're making) is a byte that can't be used by the software that actually needs it, like video editing, data processing, 3D work, CAD, etc. It's incredibly short sighted to think that any consumer application runs in a vacuum with all system resources available to it. This mindset of "but consumers have so much RAM these days" just leads to worse and worse software design instead of programmers actually learning how to do things well. That's not a good direction and it saddens me that making software that minimizes its system footprint has become a niche instead of the mainstream.

tl;dr, no one is looking for their RAM to stay idle. They're looking for their RAM to be available.