If you take a look at different pistols, you might notice some have a slide stop that lends itself to releasing the slide (Beretta 92FS, 1911) while others have a lower profile design that doesn't work well for that purpose (Glock..etc.).
So you're saying its just a matter of leverage? My berretta has a slide lock lever that is about an inch long.. It doesn't take much force to disengage it at all and is how I prefer to release the slide.. Seems much faster than having to use two hands.
I would imagine that my Berretta 92 is not nearly as "concealed carry" friendly.. You basically need a shoulder harness or a wheelbarrow to carry it around as it feels like a brick.