While I'm not exactly going to fully participate with my life story on gaming consoles, know that I've, quite literally, had almost all of them at some point or another: the only two I "skipped" were the Xbox and Xbox360 because they came at a time when I was solidly ventured into PC gaming. I was PC gaming at 1080p when I had a GameCube, for perspective.
What I DID want to chime in on is mentioning the Xbox One S and Xbox One X, both what I consider to be some of the best console designs ever made during their time. You like small, sleek, and quiet, and both of those were exactly that. They carried the design philosophy into the Series X, and you should know that despite being a rectangle, it's actually still considerably small, sleek, and quiet. In terms of gaming console design, Xbox is actually at peak right now (even though that's super hard for a LOT of "gamers" to hear). They've popped out three top quality console designs in a row, and nobody really seems to talk about this hence me chiming in on your post.
Granted, you like the Series S, but I personally don't recommend it in the face of the Series X. It's one of those nice "budget" options you can secondarily place on your desk and connect up to your 1080p monitor, and I currently see it as more of an extension of the Series X for the "bedroom/office" desk where someone does not have a desktop PC and instead just connects a laptop to monitors (which is the case with many working individuals who work from home). As a serious, big screen TV console, the Series S just doesn't really cut it in the same vein that the Switch also doesn't.
That of course speaks to the final part: your core belief in simplistic design focus. You want something built to do something specifically, and the truth is that despite Xbox/PS having far more "PC-like" consoles, the vast majority use them exactly the same way you use your Switch: turn it on, pick a game. What IS actually difference is the complexity of the games themselves. Since Nintendo's hardware can't do it, many games coming to these other consoles are hundreds if not thousands of times more complex in their designs, multiplayer, graphics, add-on content, etc., and thus you end up with always needing internet, updates, etc. that create that "PC-like" experience.
Case-in-point: pick an indie game, something simple. Play it on a Series X or PS5. It's as simple as you playing on your Switch. The complexity is actually less the console and more the games. The consoles do more because creative people want to do more, not the other way around. If you go for games made by indie devs, they tend to make their games with a more simplistic focus like Nintendo, and you end up with the same kind of experiences.
Besides, let's not forget that thanks to technology, I'm no longer blowing on cartridges or cleaning the goldfingers... or getting mad at someone for scratching the CD, or having to use CD head cleaners, or having 3 RCA cables, and having a bunch of cables running across the ground and getting tripped on cuz we're all getting a bit TOO excited over that skillfully shot green shell, and can now play with those same friends even if they now live in a different country as the years rolled by. Nostalgia is a powerful drug, but not everything old and "simple" was better lol
