[AtlUmpSteve]

In a 3 umpire crew, as presented in NCAA, there is no reason to go inside; there is an umpire waiting at second, and both that umpire and trailing plate are inside, so staying outside brackets any possible play.

In a 2 umpire crew, the only better coverage is when the BR returns to first. In that case, you are not in the line of the possible throw, and, as noted, are already close to where you want to end up for your B position.

If/when the runner goes to 2nd, you are not in as good a position as being inside. Yes, you can get a 90 from there, but the inside 90 is a better look at the play, and does not place in the line of the possible overthrow.

If/when the runner goes to 3rd, you are trailing, not ahead of the play; or else your partner has to pick up YOUR play, and be out of optimal position if the runner turns and goes home. Sure, they can; but shouldn't need to.

Given that all mechanics are a trade-off of advantages and disadvantages, I would say that, except for 3 man, or coasting in 2 man on a sure single, this is a bad mechanic to prescribe as a default.