Well after fully digging into this game back around May-June I finally finished it last weekend. I totally did the grind, put in about 90 hours, and have 99% done. The game unfortunately does have ways to allow players to miss out on completing some tasks w/o any real notifications of what they are. I googled this phenomenon over the weekend and my circumstances are nearly identical to a number of others but I wasn't able to fully identify what I missed as the stuff I read wasn't the same. I'm aware of some things I can still look for in Hogwarts/Hogsmeade/etc. but otherwise, nothing really else is left but in my challenges, it says I'm missing one enemy/side quest but that's it.
I had a blast and it was a fun way to spend the summer. I haven't played a game like that in the summer since my youth. I can easily nitpick a number of things but overall I really enjoyed it, especially the story, visual designs, and dedication to lore. Next on the list is much more dark, RE4, but with Starfield being so close to launch there's a chance I might do that if the first reviews are positive enough. At the moment I'm having a hardtime paying 60-70 for RE4 given that I feel a little bit burned with content from the last two (Winters Song and RE3).
Edit: Just to add it was also nice seeing how well the game could scale across all three of my rigs and laptop. From 4090 (DLSS3 framegen worked well here) and C2 to the hybrid 3090 Ti and 32:9 CRG9 (flying is an experience on this) to the air-cooled 3090 and 65 IPS Z9D, and even a little testing on my 130W mobile 3070 laptop, the game did well with various adjustments but it can be a little CPU intensive at moments.