Aside from it serving no other purpose except for being wholly iniquitous, my contempt toward sedeism is based on it being schismatic.
No approved authoritative Catholic source has EVER TAUGHT that Sedevacantism wasn't schism. Period. End of discussion.
Again, you fail to make the proper distinctions.
IF the V2 Papal Claimants are legitimate popes, then they are materially in schism. But, even then, since their refusal of submission to them is based on material error, they are not formally schismatic.
If the V2 Papal Claimants are not legitimate popes, then they are not even materially in schism.
So your allegation that they are in schism involves begging the question ... the assumption that these men have been legitimate popes.
Sure, one could argue that it's schismatic to arrive at this conclusions based on your own private judgment, but then one can argue just as well that it's FORMALLY schismatic to refuse submission to the man you CLAIM is a legitimate pope.
Consequently, the risk with R&R is of formal schism, whereas the risk with SVism is material schism. Which is worse?
What frustrates people who debate with you, Stubborn, is that the majority of your arguments derive from begging the question.