I've never found stippling needed on a poly gun except in a few cases and those guns where sold as-is instead of taking a soldering iron to it. The M&P grip texture along with the ergos is perfect IMO.
I understand the removable grip panels can be replaced, but I never understood why you'd do it to the frame. Looking at it from a structural standpoint, melting and poking little holes in the plastic will thin out the walls and maybe, just maybe fail later down the line. I'm sure most who've done it will disagree, but it just seems like a possibility.
Now I do modify the internals, but only slightly. My current FS9 has the new Apex looking factory sear and reset so it's staying completely stock. If the Compact I won on GB comes and is of the older type, I'll throw in the Apex sear I have on hand from the Shield I had and polish/round the striker block.