The bite adjust screw thing then, screw that in and out on XT during a bleed and you can get more bubbles out. Does little else !
Ah, Ok that makes more sense! Although it’s a badly kept secret that the SLX does have the bite point adjust mechanism (or free stroke as Shimano call it) in the lever, but Shimano just put a blanking screw in the hole to disable it on the SLX, to make a point of differentiation with the XT. Some clever folks over on MTBR here have removed the blank and put a normal M4 screw back in to activate it on SLX and Zee levers. Can’t be bothered myself, because as you say, does bu@@er all on my XTs anyway!