What a rollercoaster of a thread. Had no idea the train stopped at meme station.
It’s effectively limitless because nobody’s going to reach the end. ABC is correct in that the scaling stops at 200, although I’ll happily add more if someone miraculously beats that.
Crucible 170 is roughly SR40-50. Shattered Realm goes beyond Crucible difficulty.
Unique rewards stop at SR60. Anything beyond that is fair game for unfair boss comps and quick deaths. Builds that can reliably go beyond SR60 should not be asking for buffs. 
That’s how you end up with enormous power creep.
There has to be a happy middle that is aimed for and the few outliers need to be brought in to that middle. If players point out both ends of the spectrum to us, we can then make use of that data to address the issues and achieve a healthy build diversity.