I still feel that seeing a XP Desktop screenshot invites to much more experiences (possibly online) than a Win10/Win11 screenshot. It may be with the fact that I associate it to different internet eras as well. With XP I used to browse websits, fansites, blogs, forums, chats, MSN messenger/Yahoo Messenger/etc, whil now everything seems to be the boring social networks where almost everything is generated/shared.
Internet used to be much fun back then, and it may be the reason why most of the people have good memories about XP. I think the main reason (and I wanted to write an "essay" about this for a while) it's that we were offline by default in our lives, and we used to "go online" for a few hours durnig the day. Then you had your experience in the real world and went online to talk about them. Now it is the other way around - we live online by default, sharing photos and videos from a concert almost in real time, photos from a museum, etc. I think it took away its novelty.