Why not just fully use computers, then?

If the problem is that an incomplete switch to technology left us in a chimeric state where we have the worst of both worlds, why not remove one of the two? If we remove the cameras, old umpire error will move the box up; if we remove the umpires from pitch calling, the new computers will have no trouble doing a bunch of math and moving the box up.

This seems more like an incomplete implementation of an idea, rather than a fundamental flaw.