https://www.cheatsheet.com/entertainment/fraiser-was-niles-obsession-with-daphne-inappropriate.html/

Frasier, much like other 1990s sitcoms, employed the “will-they-won’t-they” storyline to keep fans interested. Friends did it with Ross Geller and Rachel Green and Frasier used Daphne Moon and Niles Crane’s potential romance to keep fans engaged. While Niles and Daphne end up together in the long run, Niles’ unrequited feelings come across a little bit creepy. So, was Niles’ obsession with Daphne bordering on inappropriate? Some fans think so...

I saw this posted on Facebook and it kind of made me roll my eyes and peaked my curiosity at the same time. I wouldn't say it was inappropriate but I think they wrote it this way to drag it out and keep people watching. I'm glad that I found the show in 2010 and was able to watch the whole series in 8 months instead of the seven years it took them to get together