Exactly.
If you're properly target-focused, your eyes/braun will "blow" right past the relative "clutter" of the BUIS, anyway.
Get some good training by an instructor (either "tactical" or competition shooter, it doesn't matter) who specializes in the pistol-mounted RDS so that you get good primacy with how to acquire the dot, before you ingrain any less-desirable habits that might just slow you down (and then have to work doubly hard at eliminating, later!).
Consistency in presentation is the key. With open irons, our eyes/brain is recalibrating that presentation at supercomputer speeds (don't believe me? watch some of Frank Proctor's stuff, and you'll be convinced), allowing a good shooter to literally break the shot on-target precisely at the moment the sights come to full presentation (or even sooner).
That dot should just "appear" when you present. If it doesn't do so, that means that your presentation is itself less-than-perfect (as later "fixing" the gun's position at full-presentation allows you to visualize the dot). If it doesn't do so consistently, it means that there's consistency problems with how you present.
Sight configuration/features are a highly individualized preference, and there's pros and cons to every choice made. The best thing to do is to experiment for yourself, to find out what *you* actually prefer. To-wit: how many different sights are out there that carries the names of one or another big-timer in the industry? If there was truly a superior sight, wouldn't *everyone* be using that sight?

Both objectively and subjectively, we each "see" a little differently from another person.
Folks worry a bit too much about the BACKUP irons in both the long-gun and pistol contexts. Switch off your dot, and test yourself to see just how far away you can shoot, with what kind of speed and accuracy, at a target (of noted size) *completely* without any sights, using only the body of the weapon and your kinesthetics as guide. I will bet that you'll be surprised at what you can do. A good handgun shooter can easily hit center-of-mass on a torso-sized target at upwards of 40 yards in this "unsighted" manner: I've witnessed this firs-hand, many times. In terms of the carbine, Joe Weyer of the Alliance Police Training Facility noted that in all his years of teaching CQB, no student ever deployed his/her folding BUIS on their carbine when they encountered RDS failure, and yet every one of those students were still able to meet marksmanship standards.