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They’re really burly. I’ve rebuilt a Franken AXS derailleur with the lower parts of an SX and it’s been smashed so much but keeps rolling.
Other end, I’ve got an XTR rd that just refuses to go to lowest sprocket.
Chak-
Probably a tiny little graze on the metal just near a pin/bush/pivot jobby, sometimes really hard to spot and causes it to not return to the bottom every time.
+1 on the upper tier SRAM stuff just being tougher, not used AXS, but always been of the opinion that Shimano's higher tier stuff shifts better in higher gears (9-12th) even when very worn, SRAM cassettes and rear mechs/jockeys last longer until deemed worn enough to affect anything, but those last few cogs, 10/11/12th especially change with the grace of a 1" drive impact gun, i.e. CHU CLUNK
Sram SX is garbage and should never have been made. Number of new bikes (<2 months old) where the rear mech has the same wear as a continuously used 2004 9s deore or XT rear mech, is unreal. NX isn't much better. GX or above ONLY. An actual waste of the earth's resources those cheaper ones.
BrickMan
I've got 5 XTR mechs in a box, broken in various ways. Not broken the single GX AXS mech I have yet. It's a lot sturdier. Also shifts better on XTR cassette/ chain that XTR derailleur does...