The Anarchs had the Anarch Free States so they were their own sect.
No one is arguing that.
The argument is that by making the Brujah and Gangrel (and Ministers) into pillars of the Anarchs and setting the Anarchs more overtly against the Camarilla you've basically turned them into another Sabbat; a sect defined by specific clans with their own elders who target the Camarilla as a whole with more militant actions... whereas before they were defined as being the vampire "youth" who opposed the elders.
And because the Anarchs are now basically the Sabbat, the real Sabbat got put on a bus and driven into an IED so they can be memory-holed. The V5 lore has been very clear that most of the Sabbat who didn't get on the bus defected to the Anarchs and one of the Sabbat's two pillar clans is defecting to the Camarilla while the other has been utterly MIA for more than two years now (we've had more Ravnos sightings; a clan supposedly all but annihilated after the Week of Nightmares; than we have the Tzmisce).
Honestly, this is just one more place where V5 can be compared with the much reviled Mage Revised. They too wiped out factions (the disparates in the case of MRev) and merged the survivors nonsensically. Remember when they put the Chinese Imperial Celestial magicians who'd been warring with the Akashics almost as long as the Euthanatos INTO the Akashics? Or when they put the "all non-Catholics are heathens and we'll die for our beliefs" into the ecumenical pantheistic Celestial Chorus?
Now its throwing all the groups that knew Necromancy together into Clan Heceta even though it makes zero sense (and I believe I've already explained why earlier in this thread, but it may have been over on the OP forums) and wiping out the Sabbat.
MRev also messed over the magic system the same way V5 messed over the disciplines. MRev added enforced roleplay mechanics in the form of resonance traits the same way V5 added touchstones and convictions. MRev too decided to gut Master-level play to force a "street level" style of play onto the game. MRev also had to start backtracking almost immediately due to the fan hatred of the changes.
Those who do not learn from the past are doomed to repeat it. V5 is making all the mistakes MRev did and will probably be remembered the same way (M20 went out of its way in the default assumptions/future fates sections to basically undo every last MRev metaplot element and restored magick to its 2e glory with a "bad stuff *cough*MRev*cough* happened, but it was overblown and went away and everything's back to normal now.").
I fully expect that if it hasn't been completely run into the ground by then, that V6 will be a return to form just as M20 was after MRev and D&D 5e was after 4E.