Thanks all for answers! That's pretty much correct (I don't have Pajama Sam games yet). I think also Kyrandia Trilogy is ScummVM only. I don't mind that much in case of Broken Sword becouse it is a Windows game but still it would be better to have all files or just plain great if there was ISO file ncluded.

Literally there are several games that got no linux release because there is no linux Galaxy.

I think in general GOG ships the games with a ScummVM version they have tested themselves. Testing with each new version is perhaps not a viable thing (and there can be regressions in new versions or changes in the save files system), so unless the new version includes bug fixes for a serious game breaking issue, they may not see the need to move to it.

But, yes, on occasion, GOG will update the ScummVM version that comes with some games; this has happened in the past.

The user/customer, though, may freely install the latest version of ScummVM on their platform, manually, then add their GOG installed games to it and play them that way (launching ScummVM).

Or, in certain platforms (eg. Windows) you can replace the "scummvm" folder which is inside the installed game folder, with the one for the most recent version and keep using the GOG shortcuts for the game -- I expect however that, in this case, if you then use Galaxy's "Verify/Repair" feature, it may restore the old ScummVM version.

Ahh, alright, I understand Sir Praetorian, thank you kindly for your reply. I'm off now to the lands of Sherwood to help those in need, as well as my King.

ScummVM added support for Sanitarium:

https://www.scummvm.org/news/20211118/

There is a demo available if you don´t own the game. The Android version i use on my phone is not still supported (v. 2.5.0.) so i can´t try it.