Joseph,
Yes I take your point about 'occupations' and the relationship to the totality of the movement but on the matter of....understanding why the workers movement of the past stalled before extending geograpically and socially to achieve communism in terms of both the 'objective' and 'subjective' conditions of that period and the relationship between the two - (not to condemn restrospectively) is perhaps still of value in understanding our changed circumstances and in learning lessons for the future, if only about what to avoid?
The 'communisers' help us think about that also even if many (other than Troploin) get stuck in an overly deterministic mode of thought.
Having looked this up, I think they'd dispute this. They make a distinction between 'a quantitative accumulation of struggles which, at a critical point, is qualitatively transformed' (which they reject) and a 'qualitative shift within the struggle itself as it reaches its limit' (which they endorse). I think this is more-or-less Malatesta's critique of Monatte's naive syndicalism though, so back to 'not wrong, not new'. And I'm not sure the difference between these positions is as great as implied.