There tends to be something funny about Zotac top end cards. On this one it's a slight, niggling performance loss preventing it from reaching its advertised performance. That would bug me enough not to buy it, although I wouldn't notice it in everyday use. Why should I knowingly buy a flawed product when I can get perfect for similar money? It's not even all that quiet, either.
I previously had a Zotac GTX 1080 AMP! and that experience didn't end well. Firstly, it had that very irritating fan noise pumping issue problem that I
posted about, then, after less than two years of relatively little gaming and no overclocking, it kicked the bucket. I was lucky that Amazon were so generous and immediately offered me a full refund for it.
Add all these things together and it's a brand that I just don't trust anymore. The two top end MSI cards that I bought however (780 Ti, 2080 SUPER, both quiet fan versions) work beautifully, on the other hand, with no niggles.
My very old Zotacs in the form of reference GTX 285 from 2009 & GTX 580 from 2011 still work fine to this day too, even though they're kinda noisy about it, bless.