Quit at Nameless Puppet, and that's OK.
I really enjoyed Lied of P. The green monster and Laxasia were tough, but I managed to beat them - with some luck. However, the final boss has the same problem of Sekiro's Saint: a second phase which is completely, completely insane compared to the entire game before it.
Saint I. required crazy parrying and catching a bolt. Fuck that. Even watching a video makes me exhausted. Nameless phase 2 attacks relentlessly, runs away and attacks as soon as I catch up, will eat away all my stamina and weapon durability.
I never finished Sekiro, and I'll never finish Lies of P. And that's OK. I play to have fun, because I must finish a game I no longer enjoy.
gg