Would be easier for them to implement a trait/JA at set level points that either directly reduces the base BP delay, or simply reduce the cap on how much we can reduce it with current methods. We can already put on more BP reduction than the system will allow us to reduce it.
This is the way of thinking that has put us where we are now. You need to fix the actual problem, regardless of work involved. Besides, I don't think this would be more work than the BST update (not sure how long they worked on that one though) where they had to add a whole new points system to pet TP moves.

We are in the current situation because of SE's quick fixes every time, instead of a real fix.