Different strokes kind of thing. If my near vision ever starts to go i will go to something like this.

Until then I just do a whole bunch of dry firing and that takes care of most issues people worry with about sights.

I found a website with online drills that I like enough to buy a yellow barrel so I don't shoot my TV.

I spend at least 15 minutes a day doing dry fire drills. It definitely makes a difference when I confirm my training with live ammo.