Why didn't Ichigo do dope-ass shit like this & used his version of instant regeneration and much more in his battle against Yhwach ?

Okay , I'm not one of those who say " Why didn't Ichigo just straight up used Hado no 999 " cuz clearly the boy is inexperienced. But I feel unsatisfied in his whole arc of having blood of all 4 races concluding just so he could cut the Reio in half , which is very humdrum and dull.

But It would have been so cool to see him actually using a move set of all 4 races. If not voluntary atleast they could shown it Blut Vene and Sonido which he uses subconsciously. In the final fight, except for a Gran-ray Getsuga, there was nothing more lol !