It may not make sense to you, but for those of us who have been here on meta for 6/7 years offering assistance to people in Support it will always make sense to have a rollback strategy.
Bugs do make their way into tests-passed, occasionally rubygems rate-limits impact rebuilds and even GitHub has had the odd wobble. For that reason alone I don’t see any value in making a state change which makes it more difficult to simply rename a file and ./launcher start app.
Your appetite for risk may be different, in which case you can take a different route. For those who regularly help pick up the pieces the current guide works well.