having bigger block size is not technology, it is child's play. besides since nobody uses these altcoins they always have empty blocks. they keep spamming them to keep the size up but they can't keep at it and the size drops down to near zero again. that is the only reason for their lower fees, lack of usage.
the problems aren't with nodes and community either. it runs much deeper. for example more than 90% of the hashrate is being controlled by the same people who control these altcoins.