I didn't "embrace" the micro red dot sight (MRDS) craze for the longest time, stuck with 'iron sights" as my eyes aged, I began to take a closer look at the MRDS options?, glad I did. It's the future, and I enjoy shooting much more. I wouldn't purchase a pistol today without the MRDS option.
Your going to get people to "chime in" about reliability and "what if's", unless your an SF dude, not likely your depending on the pistol for "life and death" situations. Battery life in optics like the Holosun is 50,000 hrs, so you could leave it on all the time, however with the "shake awake" technology, that's not necessary. Reticle choices, and mounting optics are many, so it really is the future & no need to spend more money on iron sights.