I think that was true in the 90s. Far less so today. With 68 percent of snaps in the NFL now taking place in the shotgun, I think the offensive line is less important now than ever.
Except maybe in the playoffs. But the arbitrariness of the playoffs is not really something you should build your team around.
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 build defensive game plans around pressuring the quarterback these days. It helps them hide deficiencies everywhere else on the field. Run-blocking is not as important as it used to be, but an offensive line that can give a QB time to throw is essential in the NFL today.