I can't find QB hits taken on PFR, can you point me to it?
You have to take into account total number of attempts as well. Allen, Mahomes and Burrow throw the ball a lot more than Jackson so it stands to reason they would take more QB hits as a result.
For another perspective, Jackson has been sacked on 7.4% of his career attempts; Mahomes is at 3.9%, Allen is at 5.6% and Burrow is at 7.5%. And Burrow is perceived as taking a lot of sacks, he and Jackson are almost identical there.
Hallas got you.
And sure, you will be hit more when you throw more, but I thought that was kind of the point, that we are worried about the accumulative nature of many hits. Lamar gets hit more running but less throwing. Mahomes gets hit less running but more throwing. I know it doesn't completely make up for it but it brings it back a little closer...and I still maintain that running hits can be mitigated, passing hits not really.
I just did past 3 years because that's Hurts'/Burrow's career, here is hits+sacks (they seem to count them separately)+runs
Allen 585
Lamar 565
Hurts 510
Herbert 476
Mahomes 438
Murray 423
Burrow 419
Definitely would like more judicious use of running to mitigate hits. But no one says Herbert is going to break down because he gets hit too much, and he's only had 89 fewer hits than Lamar over 3 years, something like 2-3 hits per game.