Is it a lot of investment in the Oline, sure, but if you create something special up front it is worth it.
You need both talented personnel staff and coaches for it to work right. Three first round picks in four years isn’t the right way, that’s for sure. Great way to create an unbalanced team, though.
You have to have coaching, chemistry, and talent. The Great Wall of Dallas (eh, never bought into that name but will use it for reference) had no first rounders. It didn’t even have a 2nd rounder.
They had a guy named Gesek who came from nowhere teach a bunch of no-name backups to the backups how to play hard and smart along with two 3rd rounders with real talent and a mean streak. Oh yeah, and all-timer coaching to get three Superbowls in four years and would’ve been four in a row had one of them not wrecked his knee driving drunk.