OLines like the ones we had in the 90s just don't really exist anymore, free agency makes it almost impossible to re-create that in today's NFL. That, and the fact that defensive lineman are much more athletic than they were 20 years ago. The Niners are really the only team that can just line up and run down the defense's throat with any real consistency, but that's due in large part to how they constructed their team. They spent an unusual amount of money and high draft picks to construct that line, and they were able to do it by neglecting positions like QB and WR. We are not cunstructed like that, at least not with this current core of players.
Garrett is calling plays like he has Larry Allen and Erik Williams on that line, just straight ahead Isos and Powers. He's going to find that's incredibly had to accomplish on a consistent basis if he doesn't change up the scheme.