Plenty of chaos, strife, division, confusion, and scandals/evils in the Sedevacantist quarters of the Trad world. It's not the shangri-la of clarity and simplicity that some make it out to be.
It's quite dishonest for Bp. Sanborn and others to point to the recent "problems" in the SSPX in 2012 (which occasioned the start of the Resistance), and beat their chest about how it proves the shakiness of Recognize and Resist, and why sedevacantism is so much better.
History would strongly disagree with that assessment. If split-offs, divisions, etc. proved your position wrong, then Sedevacantism was proven wrong decades ago, within weeks after it started. They can't even agree on whether or not to elect a new Pope. "It's been 60 years, but yeah, we probably can just do without one. The Orthodox are just fine, right?"
Strike the shepherd, and the sheep of the flock will be dispersed. That goes for sedevacantism as well as other quarters of the Trad movement.
One basic, well known problem is how the SSPV, particularly Fr Jenkins reject Thuc line orders, so that puts puts the sacraments of CMRI and others out of consideration. Daniel Dolan and his consecrator Mark Pivarunas are by that reading no higher than priests, certainly not the auxiliary bishops they claim to be. Sede Popes has proven horrifying, what with the Palmarians and the Independent Catholic Church (known for their 70s 'March on Rome,' UFOs are now a core of their theology), and allegedly Francis Shuckhardt, claimed to a Pope among the CMRI leadership. Yet another notable issue for some is the non una cuм issue which seems like a means to promote cultishness.
What Bp Williamson does, might in a way seem unambitious, but it keeps Catholics abreast of prideful diversions. The simple things need to be done well. Perhaps the SSPX could try to stop blurring things. +Lefebvre sometimes took different emphasises on issues, but never blurred the Faith. There was also the foresight in seeing that sedevacantism, particularly in its dogmatic understanding, is a blind alley. Ending up like Old Catholics with more bishops than believers, or a 'bishop in every garage' as Fr Cekada RIP once said, is just foolish.