The advent of communism was sufficiently long ago that it I'm not sure your critique applies.
That's correct, but if the communist avantguarde says (as they did) "we have to completely change the social order by force, uproot everything, to build communism", there might be questions if it's at least going to be directionally good or bad. And if the answers can't be provided, then perhaps they shouldn't be doing it at all?
Yeah it's not specific to communism, one just needs to look at the sudden changes the US admin is implementing to see it's broadly applicable, only they don't even pretend to be interested in societally good outcomes.