The AR for me was not really a go too in the beginning either, likewise I thought it would take too long to master. I under appreciated the advantages of a red dot sight that I had never tried, it’s a rifle after all, right? But with it, I can still shoot out to 500 if needs be, but more importantly, the field of view it offered, coupled with both eyes open being a very natural feel, and the surprisingly quick target acquisition, it really did change everything. It was rather impractical with a scope and the eye relief problems, not so with the red dot.
Your pistol should be more than sufficient for home defense, but if you get a chance to try an AR with a red dot, you might see a whole new world through it.
Edit: the 500 yard shots are aided by a good quality red dot with an appropriate reticle, and a magnifier that flips out of the way, none the less, for home defense and even a couple hundred yards out, a simple basic red dot can be surprisingly affective.