Copy pasted my usual answer, saving me some typing:
I converted to dots in 2020. I added a HS507c to my G34 Gen 5 so I could shoot carry optics in USPSA (2,400 rounds). I carried a Glock 19 Gen 5 MOS with another 507c. Took that gun through Tim Herron's course last Feb in Homestead. Call that 850 rounds. I also had a Glock 48 that I had milled for a 507k, but it didn't work out, so I sold it after 1,200 rounds or so because it would not chamber carry ammo.
I currently have a HS407k on my EDC, a P365X. I like the 6 MOA dot, in case I need it for the worst day or my life. I have somewhere around 900 rounds on the gun.
I believe there are at least three very significant advantages to a Red Dot / RMR / MRDS on a pistol.
1) If you are at an age where focusing on the front sight is problematic, seeing the dot becomes much, much easier. Most MRDS are virtually parallax free these days, meaning as long as your index is good enough to see the dot anywhere in the lens, when you press off the shot, the round will land where the dot is pointing.
Shooting with glases that have bifocals (my case) is particularly problematic with iron sights. I recently had been having issues seeing the front sight without tilting my head back. Using a dot allows me to have one focus, all the time. My head position does not matter. Some worry about stance with iron sights. In a gun fight, the only stance you are going to get is happen stance. Using a dot means no matter what physical position you are in, if the dot is on target when you press the trigger, you will get a hit.
There is some learning to do. It's just a new sighting system. New dot shooters need to develop their index such that they have a reliable, consistent presentation. It's not hard, it just takes some work.
2) All shooting is done with target (or threat, if you will) focal plane. You are not going back and forth from near to far focus.
Target focused shooting is something very good competitive shooters do. Of course they have extremely well developed indexes, dry practicing thousands of reps. The sights "just appear" in front of the target.
Shooting with a dot focus makes shot calling faster. You can see, really see, where your round would land as soon as you break the shot. You don't need to see the holes. If you see an Alpha and a Charlie using the sight picture, then you know to shoot a make up shot.
3) Using a dot will make you a better shooter, and will carry over to iron sights. Incorporating the dot in Dry Practice has cleaned up my index and trigger control trremendously. I think this is an under appreciated benefit of MRDS. The sight is still wobbling around, just as before, it's that now you can see exactly where the dot is at the shot break. With this info, you can work on your grip and trigger control so that the shot breaks when the dot is on target.
Disadvantages of a dot include: the learning curve, the added complexity of the various mounting systems, potential for exposure of open emitter dots, and cost. To a large degree, the learning curve can be mitigated through either regular practice, and/or a good instructor such as Asian Jedi or Aaron Cowan. But you do have to practice at it, in the beginning.
The complexity of dot mounting has gotten and is getting better. The Sig "X" adoption of the RMSc footprint is an example. The factory gun requires no plate, just two screws torqued to spec, attached to the slide. Smaller, carry ready 1" wide closed emitter dots are also coming, witness Holosun's release on their new EPS Carry model at SHOT show 2022. Gun makers are making optic ready slides with much simpler and more robust direct cross bolt mounts, eliminating the screw-on approach. For example, S&W currently law-enforcement only SKU for the M&P cut specifically for the ACRO. Sig introduced the M17, closed-emmiter dot at SHOT 2023 with an innovative front "toe" with a single retaining screw at 40 in lbs, same as the iron sight plate it replaces. Almost so simple a caveman could do it.
Obviously the cost of a dot is a discriminator for many, and I get that.
Bottom line, I have no problem if you choose to continue to use iron sights; they are effective. They don't require batteries. They always work. They are simple, cheap, and highly functional.
However many of us chose dots, not because "race gun" or "latest fashion", but because we tried them, and found them to offer solid, demonstrable, objective advantages over iron sights. For us, putting in the work to develop an index, having a single target focal plane, and overall improvement in shooting via diagnostics with a dot is worth the cost and complexity. I personally would guess, especially for new shooters entering the market, in 2-3 years, having a dot on a pistol is going to be as ubiquitous as a MRDS on a patrol rifle, but we'll see.
