Loop? Do u mean...for instance...doing 2D, Maintenance, 7set Roger get, IAD 2S (unblock), Maintenance, 7set Roger get, IAD 2S, air combo? Cause if so, ive never seen anyone do this in any of the videos ive watched, and seeing how you need 100% for this, that lowers the practicality of it a good bit (tension is way too important to just not use and expect to land this setup....and u dont even get it (tension) that fast to boot)
Here's my analysis on doing it just once:
it depends on which character your going up against, but i suppose it has its moments...i dont personally use it very often but it does give some Ok damange (in terms of bridget damage) if it connects...its just that certain characters wont even get affected by the unblock portion due to some mechanic that works in their favor (Maintenance knocks the floaties to high so they can tech before they hit the ground [doesnt happen all the time, but it does occasionally], Baiken alpha countering before the unblock portion hits, Sol can DP thru allll of that shit if he felt like it....not to mention that its distance dependent, etc.)
Ive seen it used by Ruu once or twice back in the day when AC was still relatively new (as well as in the AC unblock setups video i believe) but that was about it...fast forward to now, and i almost never see it (Maintenance) used except to get outta pressure (Mugen), and even then, its a very low occurrence.