I agree that is one thing I'd like to see diminished, but ideally with a concave surface around it so you could still push the slide lock out.  Higher end 1911s are being made that way now, along with flat-ended slide locks. 

It's interesting how tactics drive the equipment details.  That's how it should be, but sometimes the manufacturing industry gloms on to mechanical features which are tactically deficient.  Forward cocking serrations come to mind.  

And tactics go through phases, too.  For a while, sloped rear sights (think Novak) were all the rage, as they facilitated a quick stovepipe stoppage drill.  Then recently the ability to rack the slide on one's rear sight became a tactical imperative (not for the first time--everything comes around again and again in the tactical world), and rear sights with 90 degree front slopes, or nearly so, became the hot ticket on a tactical pistol.

Like these things, the slide stop being flush fit on the off-side was driven by tactics.  First, it was keeping one's trigger finger alongside the frame when not in the act of shooting.  Then, that changed to curling one's finger and placing the tip against the frame above the trigger guard, which was considered even better than laying it flat.  Massad Ayoob, among others, drove that technique.  The problem was that this often meant one pressed against the off-side of the slide stop and pushed it out, rending one's pistol hors de combat, IE., out of the fight.  So we got dished-out frames around the slide stop and slide stop pins that were below flush-fitting.

And tactics continue to drive design...

But not on CZ 75s.

...the Europeans are not nearly as quick to glom onto the latest tactical stuff as we Americans.  Heck, they still flatten the front of their trigger guards and checker them.  There's what, four or five of you Americans still shooting finger forward since the 80s ended?   Along with apparently every European?