I think the issue is a crossover of the number/stat and how it then cripples the LT via regression.
Im sure alot of people could ignore or overlook the stat itself if the LT came through it OK... but without a tweak to the QBs that have Average or worse Sense pressure, then you get the high amount of sacks, but also a huge chunk of regression in the PBK stat (circa -20 for the worst cases) which then spirals and makes that player useless.
Unfortunately its one of those things that just needs a little helping hand to balance it out. Regression is fine in appropriate doses/circumstances, as is progression... but if we allow all the LTs (or the majority) to just crumble into the wilderness, then for some people it can be an issue.
As for how the SIM engine allocates/counts the sacks up, id be guessing... but if its shifting sacks to the LT for the sake of counting them, then that could or should be resolved easily enough?
CFM is like watching someone spin plates... its great watching it work and the plates all spinning in sync, but when one plate falls, another always follows and thats the balancing act both the developers and we as players face.... we just got to keep the plates spinning