

I have been using Steam and Heroic as flatpaks for a long time, and never had any issues.
I have two NVMe drives - 1TB and 2TB. I keep the OS and “regular apps” on the first one, games go on the second one. Moving the libraries was DIFFICULT on Flatpak. Had to use external software (Flatsomething, can’t remember right now) to give permissions and even then, for some reason, sometimes installation would just fail with a “drive error”. Oh, and I had to search online to provide the appropriate Steam path for Heroic because, by default, it doesn’t see Flatpak Steam.
Well, to be fair, there was A LOT of weird stuff happening. Steam wouldn’t open at all (unless called from the terminal), or would open with just a black screen (GPU acceleration issue). At some point, I’m pretty sure, I had three instances of Steam installed. It was chaos.