This is different stuff in reality and most likely real reason why Russia long ago had sent T-54 etc stuff to dumbass is real life that they are usable as like 4 inch high pressure rifled field guns in dumbass. And for these they does have damn a lot of ammo....even if lesser than 50% or 30 % from old ammo will be usable it will not be joke at all and in fire support role this stuff will be located some 10 km or more from frontline and yup, for these they does have more than 1,5m shells supposed to be used...So I don't think that this is mandatory weakness. Mandatory weakness is Joe Biden because his administration is continuing to refuse to provide Ukr even 1 single F-16 and more than this Joe Biden personally as POTUS is responsible for 2 more important decisions: he might reduce U.S taxpayers expenses from sums that will be allocated to dispose cluster ammunition by sending this garbage to Ukraine because shifting expenses will be lesser than utilization bills taxpayers will pay.that's just a turret upgrade away from a T90.
Also Mr Biden should not he weakling pussy and allow to use old generation missiles to strike his friends country called Matushka ...if he does have some remaining of balls and brains....will see elderly healthcare outcome here.