I honestly don't care how difficult it is, only if it's possible, if it's cost-effective, and if there are any fucking corporate shenanigans that intentionally make it harder.
Also, can you please share your invention of this magical battery glue that actually removes cleanly with no fire risk and goes back cleanly to Nintendo and Apple? It’s cool that you’ve figured out how to do that even though these hardware manufacturers haven’t.
The more difficult it is to repair something, the less possible it becomes to repair it.
Damn-near anything is possible to repair with the right training and equipment but there is a very wide spectrum between what an average person can do with tools they can easily pick up at any hardware store for cheap and a little common sense and some YouTube videos to guide them, and repairs that require specialist knowledge and equipment.
When something is made more difficult to repair, it slips further into that specialist end of the spectrum, so it's possible for less people.
You could use pliers, you could very carefully hit the corners of the head in a clockwise direction with a hammer, you could spend a lot of time training the strength in your hand and arm to tighten it by hand, you could use a dremel, saw, or file to cut a slot into it and tighten it with a screwdriver
Gonna need some elaboration on that last point. You're saying having appropriate tools for the job and the difficulty of the job have no relationship?
Are you against right to repair? It seems implicit in your comments.
you need to remove stickers in a way that you can replace them, if you want to keep them looking good
You need to undo glue, iFixit used isopropyl alcohol and force
Once you're in its fairly easy to replace parts, but Nintendo don't supply parts
Batteries are glued down, you need to destroy the foam beneath them to get the batteries out, Nintendo don't sell replacement foam, or even a specification for the foam
From the teardown the only "corporate shenanigans" seem to be the usual soft security measures of hiding screws, having glue in a couple of places and using their security screws in the outer shell. I guess until we start seeing experimentation with swapping parts around we won't know if any pieces are signed to the board (something both Sony and Microsoft have been doing with optical media readers for ages, for example), but I'd be surprised. I assume iFixit have either tried or will try soon.
I think the difficulty matters, particularly for stick replacements. The Switch sticks weren't super easy to change but it was doable. I'd say this one is... harder. I'm hoping the sticks are more reliable, but I would seriously consider buying an aftermarket joycon before trying to replace a stick myself on this one. That's perhaps the one significant escalation I see here, and I will give it at least a bit of a pass in terms of difficulty because man, are the joycon insanely packed with stuff.