The question is also: does it matter in reality?
I don't want to dismiss your point, but just to use myself as an example, both Steam and Galaxy are negligable during play, but Discord uses 2% cpu on my system just sitting in the system tray. Playing flac music can be 3-5% and having a youtube video on in the background is 3-4% cpu for 720p or less, 8% for 1080p and 20%+ for 4K.
So it is worth it to actually look at what uses resources in reality, and not focus on a client.
Galaxy does log A F**KTON of useless stuff. It is on a nvme drive so it doesn't slow down my system, but it does annoy me. There is no reason for 300+ MB of log files.