The problem is not these tools, but implementing what is the right thing to do during an outage or even properly detecting one (what happened with github). Your solution might work 99 cases out of 100 but that remaining 1 case might cause your data loss.
When there is a human required to do the switch it typically he/she can investigate what happened and make the right decision.
It's theoretically possible to have a foolproof solution that always works right, but that's extremely hard to implement, because you need to know in advance what kind of issues you will have, and if you miss something, that's one case where your tool might make a wrong decision.
