I would rather have Mayfield and his $36m deal than Dak and his $60m deal. $24m would cover keeping Pollard and Biadasz, as an example.
https://www.espn.com/nfl/stats/player/_/table/passing/sort/QBRating/dir/desc
Overall, I would say that there are 25 QB's in the NFL nowadays that if you put them with a good coach, line, running back and receivers will look pretty good. Dak certainly among them. That wasn't the case years ago. I stand by my statement that positional scarcity isn't there anymore. Unless you have your hands on a Mahomes or maybe a few others, paying the big bucks isn't worth it.