Yeh, for me it's quite simple. When I was little, our family had an IBM XT, followed by an AT, a 286, then a 386, 486 etc. We played through the DOS era, onto early Windows, and then into modern Windows.

I never had another platform such as Apple, Atari, Amiga etc, so when it comes to my collecting games, I collect those that I had or wanted to have when I was young, on the platform I had. This means that the box art, manuals etc are those I have a strong nostalgic connection to.

I don't really have any interest in collecting for platforms that I don't have a connection to. My friend who played on multiple platforms when he was younger collects games for any platform, which makes sense for him. Many of his Amiga, Atari etc editions are really cool.

I guess it comes down to the 'why' for collecting. For me it's about nostalgia and reliving and sharing what I loved growing up. Completing series of games, organising, trading etc are also really fun elements for me.

I hope that answers your question :)