I have an LPVO, because I could only afford one good optic and by the time I added 2 QD mounts that is pushing up to 300$ just in mounts. At that point I start thinking may be better to invest a bit more and get a second upper better dedicated to what you want to do with it. That or run an offset red dot in conjunction with the LPVO.
When I was making this decision I had to be honest with myself about a couple things.
First off, I use my ar all the time for hunting and longer shooting than a dot really accommodates well. I don't clear houses for a living nor do I pretend to do so. 100% of my real usage is if not superior with the LPVO, then atleast not hindered by it. Mostly I shoot in the day, so no problem, and the dot is bright AF (PST 1-6) if i need it/have time to turn it on. Also, whenever I am shooting in the dark, I have my weapon light on, so even if the battery died, I dont have much of a problem just running the cross hair.
Second, I ran irons before this and never really felt hindered, and a LPVO is an improvement for me up close, and for sure far away. Would a dot be better? Yeah, but I think that its starting to split hairs.
Third, you can point shoot a rifle pretty damn well at close ranges if you are familiar with it. I'm not saying that one should rely on this in a serious situation, but try turning off your dot or removing the optic and try shooting silhouettes at like 3 yards. Now maybe that super navey seal hostage headshot in half a second wouldn't go so well, but still. I could have a bananna mounted in my scope rings, and at the distances inside my house, youre not missing a torso sized target.
So do I think that having an LPVO vs a dot would be a big enough disadvantage in a defensive situation to worry about it? Not at all. An Ar with a light and any 1x aiming system, dot, irons, scope, whatever (assuming you train with it!) is already such a huge advantage already, that Im not going to stress about it not being the most ideal. Now, If I had the money to burn, and didn't have other projects to spend it on? Yeah Id 100% have a Qd dot and scope setup, or just have 2 rifles. But id be more excited about the lighter weight of the dot that any advantage it gave me...