i believe the law is more about easily being able to replace a battery for repair than being able to swap it on the go

I doubt they'll circumvent this. They don't seem to circumvent the mandated USB-C port if the rumors are to be trusted.

We can relive having your phone explode into three separate pieces when you drop it! Seriously though, this is good news in my opinion.

"Exciting"

Yeah. And battery issues are one of the biggest sources of new phone purchases. This is going to help reduce e-waste for sure.