^^^ Comrade, those sects do fit into those criteria. The "transitional" sects vacillate between the mass strike left and the frontist left. I've stressed before and again the need for a revival of independent but institutional approach to class organization, updating the profoundly true and important lessons of the original Socialist ("Second") International to today's circumstances.
"A new centrist project does not have to repeat these mistakes. Nobody in this topic is advocating a carbon copy of the Second International (which again was only partly centrist)." (Tjis, class-struggle anarchist)
"A centrist strategy is based on patience, and building a movement or party or party-movement through deploying various instruments, which I think should include: workplace organising, housing struggles [...] and social services [...] and a range of other activities such as sports and culture. These are recruitment and retention tools that allow for a platform for political education." (Tim Cornelis, left-communist)