A misconception about offensive line position switches is that they’re simple. Shifting a behemoth away from a position he’s played for years takes more time than a few days or week as you re-establish a foundation. There are such intricacies to switching sides up front, let alone positions, that the transition can be rough.
Yes, you can select offensive linemen in the top rounds of the draft - particularly on the interior - and generally expect them to be impactful Day 1 starters. That’s part of the reason the Bears have invested two second round picks in Cody Whitehair and James Daniels in the last three years: they’re core pieces that are easier to develop, and take less effort to do so.