Personally I actually agreed to the deal -- the job that followed I finished in true Thief style, I think the first time in the game I ever went someplace without getting spotted neither going in nor out. 😄 But also later found that in true genre style, it wasn't a necessity, and that there were alternatives, such as the one you mentioned.
I staid up all night, pretty much because of the game. Hasn't happened in a while. While they should fine-tune AI as well as camera post-release, there also seems one glaring balancing oversight (which I've first seen brought up by somebody else).
Dishonored had its mana pool you needed to activate abilities. Here it's simple action points. In both cases, to a degree, they auto-regenerate (which also meant in Dishonored, that you could "blink" as often as you wanted.) The maximum action points pool is 20. The auto-regeneration fills it up to 5 again, over the course of about 15 seconds. To regain full action points, you need a potion (or sleep).
For most abilities, this is naturally a bit of the burden it should be. 15 seconds would be a lot if you're say engaged directly in combat and thus had to wait until the points have recovered. HOwever, not so for instance the rifle's "sentry silencer" ability. Activating it costs 5 AP. Your next shot will not merely be silenced, but cause significantly bonus damage to an enemy. Rifles have decent range. Basically, it's a bit of a sniper thing.
Coupled with hiding someplace or camping on a roof, this means time is never much of a factor. You can just camp in your hiding spot and wait for the action point pool to rise up to 5 AP again, and spam this quite powerul ability. Taking out entire enemy camps easily one by one.
In their official feature request boards, I've already raised this. If you agree please upvote. On/off option for auto-regenerating action points - Weird West (featureupvote.com)