I have mixed feelings on this. I think there were a few good reasons to move to sealed batteries. In an ideal world you could give consumers choices between the various trade-offs and offer multiple models or variants.
But of course that will never happen because non-replaceable batteries present a far better business case. If they were forced to offer options, the manufacturers would deliberately make the user-replaceable models far shittier and then complain to the regulators that they were unpopular.
No need for regulations, just set a price floor please. Only billionaires allowed.