You're absolutely right, and in lots of areas I use FOSS alternatives solely because they are FOSS despite less resources and objectively worse UI/UX. Photography is a hobby of mine, a huge love. There is nothing on Linux that gives even remotely close to the ease and comfort of use for RAW image editing as CaptureOne Pro, a software I paid a pretty penny for some number of years ago. I've tried every RAW image editor that's been recommended, and I dislike them all so much that I actually prefer to move my RAWs to my phone and edit them there.
Despite that, I'm still running Linux. I understand the trade offs that often need to happen to adhere to an ideal, and I largely agree. However, sometimes FOSS comes out on top in all regards, including UI/UX. And those are the apps I'm inviting everyone to share. 😉