Thinkpads are pretty much unique for that amongst mainstream manufacturers though. Other manufacturers are varying degrees of awful. Compounded by people wanting absurdly thin laptops.
Batteries (and other components) are just glued in place. It's sometimes possible to replace stuff but you really need to know what you're doing.
And obviously, from the manufacturer pov, this is a feature. They don't *want* you repairing or upgrading, they want you replacing. The logic of capitalism rather than the logic of *what would actually make sense for people*.
Shrinking enthusiast market. Probably 90% of computers stores around here got wiped out by the pandemic, supply chain issues, yadda. Most people can do what they need on a phone.