Honestly I don’t know why you want to 100% it. It seems like you’re not having a good time. It’s okay to stop games instead of forcing yourself trough something you don’t enjoy.

Having said that AFAIK the PC version seems pretty stable. There are some perfomance kinks but overall the game seemed to run good. My partner has not reported minor or gamebraking bugs aswell. So this side might be on the switch port.

Now let’s talk about the actual game. It is incredible shallow. That’s just it. But honestly I think that’s fine. The game was made not made for people who play a lot of games and more importantly I don’t think the actual gameplay is the selling point of the game. It’s the incredible and rich presentation of Hoghwarts and it’s surroundings. The amount of unique assets and beautiful textures you find in the castle are incredible and it’s clear most of the development budget was spend there instead of the gameplay.

The word as a gameplay playground is horrible as you said. Countless of meaningless repetitive tasks. But as a backdrop to the focal points of the game they do their job. I don’t think the game is a game of the year but I’m still impressed by the visualisation of Hoghwarts and it’s surroundings. I’ve expected this game to be way worse than it is.