I do think good team Offensive Line play is something of a lost art. It’s now all about brute strength instead of technique.
Teams can afford to keep maybe two linemen over a period of five years. Moreover, the practice time in the NFL has been cut down to nothing in an effort to limit injuries/deal with CTE issues.
So Joe Bugel in his prime would have had Grimm for 10 years, Jacoby for 6, and a revolving cast of rookies and free agents at the other five positions. And then he would have had two hours a week in the season to really coach ‘em up.
Part of the reason for the decline in O-line play is that there are fewer practices in full pads than there were 10 years ago, and you just can't improve technique without contact. And this extends down to the college and high school levels as well.