Basically, it just gives me tactile feedback when holstering. Probably just due to being an old fart, and having decades-long practice of keeping my thumb on the hammer of non-striker-fired guns when reholstering. Just a way of monitoring (not controlling, just monitoring) the state of the firing mechanism when reholstering.I see no point in it but that's just me..
I totally get that we should look the gun into the holster, and I do. This is just an additional feedback for me; a way to absolutely know whether something is impacting or influencing the firing mechanism. I also totally get that in a perfect world, it would serve no purpose, but in a perfect world I probably wouldn't feel the need to carry a gun in the first place.
To each his own and ymmv; just was trying to address the OP's inquiry from my personal experiences.