I think getting ahold of a supply of RWS is difficult for Ukraine at the moment. So that's one reason why they wouldn't use them on their MT-LBs. Another possible reason I was thinking is one of height. The MT-LB is very squat and seems a bit short for a Stormtro...IFV. IIRC dismounts need to basically climb over the engine compartment to get out of it.
A RWS would need to be mounted on some sort of tower to give it enough clearance to provide effective fire for dismounts. A lot of the guns and rockets we see mounted on MT-LBs either themselves have a fair height or look mounted for lobbed/indirect fire. A foot or two of height difference will significantly change the fields of fire for a RWS. With too little clearance they wouldn't be able to depress the barrel to fire into trenches. That eliminates some of their utility on a battle taxi.
Then of course there's the MT-LBs light armor. Equipping it with a relatively short ranged RWS will tempt commanders to try using it as a battle taxi and drive up on trenches. It's a lightly armored tractor rather than a real IFV.
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