"hostage"
They annually harass me with licensing checks and questionnaires because they really hate you if you run Photoshop inside a VM (my daily driver is Linux), although it is explicitly allowed. Luckily, I don't need the Adobe software that often. But they hold a lot of important old company documents hostage in their proprietary file formats. So I can't cancel the subscription, no matter how much I'd like to.
Gimp can't handle them?
0 - https://forum.affinity.serif.com/index.php?/topic/225143-wha...
Basically any given PSD will certainly load correctly in photoshop, but you're rolling the dice if you want to load it into anything else. More so if you are using more modern features.
Performance is obviously going to take a hit though. Depending on the machines in question one would probably get better results from a current gen x86 box running that same Windows version of CS1/CS2/CS3 running through WINE (or of course Windows 11, but then you’re stuck with Windows 11).