I know many like to justify the offensive performance because of "historically bad OL" but I'll just put this out there as perspective.
Obviously the OL was awful.
But other teams have awful OLs as well and manage to at least be halfway competitive.
At some point, the skill positions at QB, RB and WR need to overcome the awful OL to at least score a couple TDs.
Hopefully better HC/OC will help next season since the players aren't really changing.
Note - have no idea who this guy is (writes for The Athletic?) but he uses ESPN/PFF stats. I'm just assuming his numbers are accurate.