This ^ is the pragmatic position of the SWP. There is no point the left trying to resolve these disagreements through debate, they should just agree to fraternally disagree. For in the end the only real invigilator/arbitrator in this debate, is class struggle. Testing the arguments, in the material world, validates or invalidates their veracity, not debate.
This ^ means that difference, diversity, is a good thing. Each SPGB, SWP, SP etc etc, should struggle/compete for survival, for success, for influence amongst the working class, for this is social evolution. But whilst struggling recognising we are 95% in agreement. Hence, agree to fraternally disagree, work together whilst competing.