What is the advantage of the slide inside the frame?
Lowers the actual barrel bore so recoil is more rearward and significantly reduces muzzle jump is the primary thing.
personally I have no problem grabbing the slide to manually rack it , but then again as I have never had a malfunction that required clearance that's not a problem either, some people seem to have a problem racking the slides on slide in frame designs.
course some people have a problem racking the slide on any semi auto as well.