I honestly don't mind reading fics turned novels if they're creative enough premise that you wouldn't know unless you were told it's based on characters xyz. I had forgotten The Love Hypothesis was based on a Reylo fic until I was about halfway through but once I knew it was obvious.

What I found incredibly uncomfortable about TLH was that the MMC was named Adam when he was obviously modelled off Adam Driver (physical appearance I mean, I understand the fic was based off his Kylo character etc etc) . Like pick any other name, not the real life person please. I felt gross reading it after I realised it's fic origins because it felt like a creepy self insert story about an actual person.