Hey OP, sorry everyone's giving you such a hard time. While I don't know that internal batteries are inherently anti-consumer, I do see that it could easily be seen as such. In defense of Internal batteries, they help to keep the size of our tech down because they are smaller than the kinds of AA and AAA that we'd end up using. There is also the convenience factor, obviously. In opposition, though, as you said, they will eventually die and game companies rarely offer replacement parts. Internal batteries are easy to lump into the category of choices that could easily be part of planned obsolescence (which is very anti-consumer).
That said, I've replaced many internal batteries on gamepades and portables with aftermarket parts from third parties, so it's not so bad. I'm much more frustrated by internal batts in phones since they are often inside cases that are absolutely ridiculous to open up.