Generally,design these days is about light weight and thin wall sections.Using less material.That polymer is sold by the pound and it isn't cheap.
So,if you start with a generous .120 inch wall,sand .030 off,then put .025 deep dimples in it...without regard for the effects of heat or stress,you have decreased the thickness/strength of the grip area.
Will it ever be a problem? I don't know.It might. If the you-tube kitchen table Dremel guy does it...???? I'll pass on the gun.I would not buy it unless it was practically a give-away.
Now,my own S+W M+P 9 C? For me? Its a tool with a job.I didn't buy it to sell it.
I did find some objectionable pressure points where my thumb went around a corner or a trigger finger tendon was moving the gun.Under the trigger guardwere some "hard" corners..
Yup! I did some minimal work with a half round file.I "inletted" my hand a bit.
I'm not in a hurry,but I can see how secure grip is good.I may add some texture FOR MYSELF,my way.Note the interchangeable rear grip panel replacement is $10. I bought a spare to play with.I have not done any stippling.
I did watch some you-tube handgun guru give a demo about simulating blood on your gun with dishwashing soap then trying to retain the gun.That was his sales pitch for stippling.I don't know.I'm not losing sleep.
IF I ever do stipple the gun,I accept I might be throwing away $100 plus resale value.Yet people pay far more to checker a 1911.It depends on what you value,but if the point is to be able to hang onto a Tupperware gun...???
I did not buy the gun to worship it.Its a tool.If you like tape,use tape.
I control how deep,how much. Its like shooting someone elses reloads vs my own.
IF I make the gun more effective without sacrificing integrity,my priorities are met.
On a $500 commodity gun,new,how much difference does even $100 in resale make?
If the gun fits,shoots,and feels good,I'm more likely to keep it.
If its perfectly original,but something annoys me,.....How much do I lose in pursuit of the Holy Grail?,Selling and buying something else? Handgun 2?3? 4?
Just my opinion,if my non-shooting great aunt Grettel who does needlepoint did a great stipple job on a plastic gun,a "Big Name" gunsmith's job is not worth a nickel more. Its not a mystic juju transfer of enchanted powers.Grettel is probably better at it.