I didn't realize that the last few seasons of Lucifer were original to Netflix until now.
If we can count documentary series that originated on Netflix, what about The Toys That Made Us? Or Disenchantment (if you're a fan of The Simpsons or Futurama)?
And FWIW, I'd count Stranger Things as more science fiction than horror.
Yes, it's actually a WB series, even if Netflix gets the distribution rights. But it is labeled as Netflix Original. As far as I know, their rights will expire in 2031.
Disenchantment, of course, Bean, Luci and Elfo.... It was an enjoyable adventure of them, I'm so sorry I forgot that. Lupin wasn't bad either as heist-caper series, but that's about it. I also watched 1-2 TV NF Original TV series from my own country. (As the Crow Flies, Love101)
But NF originals in my country are just as bad as our mainstream TV series.
I was told these are mostly commissioned from outside companies
Too dramatic, too operatic, too self-serious, too dark and too much of a social message. Frankly, I don't like it. It is very popular and I respect its fans. But I prefer to watch licensed Network productions such as Suits, Archer, Sherlock (BBC) on Netflix.
That's why this agreement was important and valuable for Netflix to have a good legacy Network library. But unfortunately, that didn't happen and what awaits us is the terrible combined service of HBOMAX and P+.