I won't name brands, but there are lots of low cost "tablet with keyboard" laptops with glued battery. Just a couple of months ago I had to ditch one.

Anyway, if most comply, why not make it mandatory? Or are these kind of directives only aimed at picking fights with manufacturers?

Note that I am not suggesting that all laptops should have USB-C chargers, that's a separate directive. I mean user replaceable batteries available for at least 5 years, without requiring major surgery to replace.