A nova sorc caps out around 5-6k damage per nova (ye ye eschutas vs cmoon cs infinity etc etc)
Blood boil caps out around 12.9k damage per boil, in an aoe a few tiles radius larger than nova
The same blood boil build can also get 30-36k damage per tainted at 22 fpa, up to 48k with prebuff and that's on top of also having +56% damage on targets tagged by a defiler, often doing about 20k damage per blood boil
And on top of the free 43% all damage mitigation from blood oath, and 2x demons tanking and ~32% max life / ~43% efrw. Oh and about 40 life/mana after each kill which is like chugging juvs

But that's not op not at all, because uh

This hold up on ptr?

You lose 95->5% amp demon, 175k -> ??? 5k? life demon, lethargy goes from 50% slow / 37% dr to literally doing nothing at all, need max mastery no matter what and 15+ bind for demons
You gain max tainted going from ~5k to ~36k, or with prebuff as much as 48k

Overall the build is probably actually buffed from current patch as long as you just use tainted and ignore demon entirely, because you need a stone skin venom lord with cursed to have a demon that both applies amp and doesn't die- and it still dies to cursed mobs who take it from 100% dr to 0% (instead of the 80% you'd expect)
using the OP tainted means it has way higher single target dps / elite sniping now, and for mowing trash mobs you can use consume + defiler

Not OP for ubers at all. I was testing this build and could not kill them using current template, best was Diablo and Baal. Have you tried on ubers and what is the strategy?

well why would you be doing ubers in the first place without a dedicated uber killing char
tainted only deal about 11% of their damage to fire immunes as they do to 0% resist mobs, because you only have conviction+sunder. So they can deal up to ~260k hp per volley non-immunes and ~30.8k to immunes. Which honestly should be enough to grind out ubers with blood boil, though you'll lack the amp damage bonus but with your own pierce and no need to worry about keeping demons alive, and being very tanky and able to instantly replace tainted, seems manageable. Mephisto should be easy with the conviction change, his resist is low anyway, its diablo and baal where they have 655k hp and fire immune / 50% dr. And with no consume / no amp you're only going to get about 6.3k hp per cast blood boil vs them (amp+consume would deal ~15k), but the tainted are still doing that ~10k fireball each after -resists, optional defiler

I mean that's pretty much the only hurdles that would exist for this char at all, p8 tz 96 t5 fire immunes are slow but manageable and same with ubers, but even p8 baal is fast now thanks to tainted since he's not immune.

To try if it can be an all in one char like the current pre PTR Echoing. Isn’t that one of the purposes of a PTR is to test different things? Have you tested your theory/math? I mean Meph is not easy at all, he kills the Tainteds easily and his fast minions spawn is a problem. I had better luck with Diablo and Baal, but still that took more time than a smiter would typically do

I tested it all over the normal tz and chaos and other relevant area but im not sure why you'd be doing ubers on anything but an uber smiter to begin with. Its not like people randomly stumble into ubers