tanks haven't been relevant since WW2. even fighter jets haven't been relevant in decades. it's all drones now.
the west is simply dumping their old and useless weapons in Ukraine - they keep Ukraine desperate so that they will fight with whatever they're given.
if there was no Ukraine the west would have to recycle most of the weapons for scrap - it's not like US army would use rusted out obsolete equipment.
remember US "forgot" $40 billion of weapons in Afghanistan on purpose - just to keep the region destabilized. the kind of "support" Ukraine is getting is similar to that - just dumping old equipment.
the strategy in Ukraine is the same as Afghanistan - perpetual conflict to keep the entire region in ruins forever.