I think I learned to do that out of necessity. Glocks in particular do not really fit my hands, so I use a less conventional two-handed hold that allows a better "clamshell" hold: I open up the front of my grip just enough that the heels of my hands completely lock the gun in place, resulting in total coverage of the grip. While most people try for a "symmetrical grip", that creates a gap at the heels of the hands. IMO the heels of my hands are the STRENGTH of the grip, because I can exert more pressure with little effort, because I use my arm strength rather than grip strength to lock the gun in place -- and that means my upper body absorbs recoil energy, not my hands. IAE, don't get cute, be practical by using simple physics to your advantage.

If the grip is large, I will cheat my hands around to cover the weak spot, again -- this is only to have as much meat on the grip as possible, improving control by simple physics. Once that is mastered, we must learn to isolate the trigger finger from the rest of the grip in order to avoid "milking*" the grip. Everything else can be wonderful, but if you milk the grip you will never be a good shooter, period.

*("Milking the grip is the act of tightening your grip on the gun as you pull the trigger. This is an especially egregious habit that destroys good shooting -- don't do it! Establish your grip, isolate your trigger finger, and then squeeze the trigger at a consistent comfotable rate. No starting and stopping, no snatching the trigger or "timing your wobble". IOW, don't overthink it, just shoot.)