To be clear, all the mentioned Nintendo products are already designed for battery replacement, with well-contained battery units and easy connectors, and the batteries are available and problem-free to replace unlike for a certain fruit company.

The redesign is because the ease of accessing the batteries did not comply with the new rules. The pro controller in particular requires almost complete disassembly to get to the module, and the Switch 2's battery uses double-sided adhesive which is finicky. Joycons can also be a bit finicky to navigate for the uninitiated.

Also, as the device is Japanese, it uses JIS screws rather than Philips (in addition to triwing), which could surprise some. These are superior for service - Philips screws are specifically designed to strip during assembly to prevent over-torquing - but they do require you to have the right, "exotic" screwdriver. As JIS screwdrivers are compatible with and superior in bite even for Philips screws, it's a good habit to just always use those instead for electronics. iFixit kits and such include them.

>it uses JIS screws rather than Philips (in addition to triwing)

I don't think this is an issue for anyone who has had to disassemble a japanese device before, and the bits are widely available online. Countless youtube videos have discussed that JIS vs Philips in the consumer space are largely compatible outside of american aircraft construction.

Phillips Heads: The design is often criticized for its tendency to cam out at lower torque levels than other "cross head" designs. There has long been a popular belief that this was a deliberate feature of the design, to assemble aluminium aircraft without overtightening the fasteners.[15]: 85 [16] There is no good evidence for this suggestion, and the property is not mentioned in the original patents.[17]

I recently changed the battery of my Switch 1, if for most of the process it was easy, and I really struggled on two points. 1) the plastic part into which the screws are screwed broke, and it is tough to remove them. 2) ungluing the battery with isopropyl alcohol without breaking anything was very long for me. I recently changed the USB port of my Fairphone 4 and it was just unscrewing and screwing. So for me it is a great change from Nintendo.

iPhone batteries are actually relatively easy to access and replace. The only annoying thing that Apple (and most other gadgets) insist on is adhesive strip mounting of the battery. Just use screws please.

Torx is also common and also way way better than philips. Really we as a society need to phase out philips screws yesterday.