There might be some minor interest in noting that I played many of the best games of this decade, like Primordia, Oxenfree, Thimbleweed Park, and Mark of the Ninja on Linux.
Also potentially worth noting are the games I didn’t play on Linux due to performance reasons (at the time), like Dreamfall: Chapters and Shadow Tactics. Also my controller wasn’t fully supported until more recently (thanks to Valve).
Something I could also track if I wanted to is language and input method. I completed Tomb Raider (2013) twice in English on Windows, once with mouse and keyboard, a few years later with an Xbox One controller, and a few years later once more in French on Linux. If I ever play Unforeseen Incidents again, naturally I’ll do it in German.
To properly make use of that I’d also have to track which languages are supported by a game, so that I can do something like filter a list of games that I last played through at least four years ago, that I haven’t played in French yet, that have a French localization available. But then it quickly becomes an administrative nightmare, or at least more in the realm of what I’d like to be paid for doing, which is where crowd-sourcing such knowledge on a website like Completionator comes into play.
PS That’s not some convoluted invention on my part. It’s pretty much the only scenario in which I’d consider replaying a game like Monkey Island right now.
One way to do something like that relatively easily would be to use Power BI instead of a spreadsheet (i.e., just grab supported language data from GOG/Steam/MobyGames/whatever), but then suddenly we’re stuck with a proprietary solution.
PPS AllMyGames imported my GOG & Steam libraries like a champ, but it’s extremely significantly simpler than Completionator. However, this could potentially be a good thing because it makes it simpler to actually quickly track something. But it can only export your “personal data”, which basically just means my e-mail address… so as nice as it potentially looks, that’s kind of a deal-breaker for me. Also I don’t like its ridiculously designed endless scrolling antics. The FAQ and stuff are at the bottom of the page, bu they’re unreachable! Unless, of course, you’re “lucky” and it fails at endless scrolling.
You might think I’m too critical or something, but LibraryThing does close enough to everything I want. It’s not a case of only something I personally designed could serve my needs. I’d settle for the pre-Amazon Goodreads of videogames. I only left because the post-Amazon changes drove me away.