Laser is an aid not a cure. If you lean to use one correctly it has no effect on your ability to use iron or any other site. Hand gun of rifle when it comes up or down to your line of site you should already know where the paint will be if you have to look for it more range time and for get using it until you get it down. The same as using a Red Dot for reflex fire .
The worst time to use a laser is full sun out side the Green does show up much better in that case all tools are Plus and minus depends on your level of training with them and how you intend to use them.
I put the sons Acog on one of mine . As a scope for AR they don't get any better. On 100 yard zero range I was slow and out of step. I was looking for it. I got it down . My Acog is still in the box While it may be about the best for an AR I would not at this time use it as my first option just not comfortable with it yet. I have others I don't need to think about to use.
Same with the laser I would not just slap one on an expect to use it effectively right away.
Daughter 380 LCP 21 feet quick fire 4 mag changes no stopping. Lasyerlte side mount in door full light. 30 rounds 95Gr flat all thirty are there. She is a shooter this was done after 20 minutes of work dry fire and give it a go. First live fire with a Laser device. Start was weapon unloaded laser off.