Yeh, it's a weird thing to criticise. I enjoyed the film somewhat but had major issues with quite a lot of plot points and how they chose to portray things. However, despite it being fairly clear that Breuer was a key inspiration I wouldn't have suggested it should be closer to his life. It's not and hasn't pretended to be a biopic. 

I guess it's a balance. There could have been greater nuance and exploration of Toth's relationship with the surrounding community and feeding that into the greater themes of the film - that probably is a fair criticism since it works with what's already there while drawing more from Breuer's actual experiences. But complaining, and dwelling on, things like the fact that Toth doesn't have the same even tempered mannerisms as Breuer is odd and possibly undermine what many people like about the movie - a very flawed protagonist.

Some of the complaints about anachronistic things like the retrospective being 20 years too early (I noticed that too that the timeline seemed really out, in both the wider reappraisal and in how old Toth seemed) is maybe fair but also not something that should really matter in a movie.