It had been in the works for a while, but now it has formally been adopted. From the article:
The regulation provides that by 2027 portable batteries incorporated into appliances should be removable and replaceable by the end-user, leaving sufficient time for operators to adapt the design of their products to this requirement.
I went from a 5 to a 7a too and it’s not too bad. I had a brief try with a 6… that’s somewhat bigger and actually annoyed me so I returned it. I still think the 5 was the sweet spot for phone size though…