I would guess that their ability to get to the roost after wing clipping will all depend on a few factors - one being how high the roost is, and the other being how many primaries you clip. I have cockatiels, and if I clip too much, they can safely land, but don't gain any lift or height. I'm sure it's the same with chickens. Good thing is they grow back during molting - so if it doesn't work out, it's not a permanent thing. I've never paid much attention to the molting cycle of my hens so not sure just how long that is. My house birds re-grow in about 4-6 months.
The feathers are like hair, doesn't hurt to cut. But beware - you don't cut a "blood feather" - a feather that is new and still has blood in the shaft. It can cause a LOT of bleeding - and in smaller birds - that loss of blood can mean death. You can pretty much tell if it's a blood feather - the shaft of the feather will be very dark as opposed to hollow and light colored (depending on feather color of course) -
The pros and cons are what they are. You limit flying, but also limit escape. You need to decide what is best for your situation.
My girls for the most part don't really fly - just use wing flapping to aid in speed running. Except for my EE girl, she flies to roost on the top of the coop now and then when free ranging - and sometimes on my back, head or tractor if I'm in there cleaning it out
- silly girl. She just likes to be involved I guess - to see what I'm doing - maybe I'm putting more goodies in there and she can get them first before everyone else finds out