EXP TNL Reduction - Level Cap Increase?

2.1b exp is not maximum, and never has been. It's the limit for unsigned ints

Unsigned = 0 to 4,294,967,295, AKA double the assumed limit.

Not that it matters; There's no reason to add more levels when most people never hit the current ceiling and there's no content for higher levels and nothing for them to spend extra SP on.

They'd need a lot of groundwork to make it worthwhile and we'll see any such changes in KMS far enough in advance to expect them.