How exactly did he "ignore" the trenches?
First four (!) Bills draft picks in 2021 were OL or DL, our first pick year before was DL, we got Star back this year, he resigned Williams and Feliciano and it is hard to argue that at least first one was above average in pass blocking last year.
You can say that he is making wrong moves but he is not ignoring DL and OL.
And I am always wondering what are fans expecting. In my understanding there were like 3 or 4 interior linemen available in FA who were "sure" upgrades versus what we had. But there are 32 teams in the league, competing for same players. Some players want to go elsewhere, some just want money and maybe Beane didn't want to overpay (which is a good thing in general). Maybe he really should draft Humphrey instead of Basham, but it is not like he has thousands of options and he is blind to see them. Again, we can always argue that he made wrong moves but he is not ignoring trenches.