My Gen4 has more of a rolling triggerpull/break than my Gen 3 Glocks. And whgile I'm not outright saying that thed polish triggerjobs are a waste of time, essentially the same thing is accomplished with properly lubricating the key interfacing surfaces and then the natural burnishing effect is accomplished within around 500 rounds of actual use.
There were reports of the finish of the Gen5 triggerbars flaking off prematurely, causing some adverse triggerpull characteristics; not sure where Glock is with that with current production examples. There are also apparently some internal component finishes made available to LEOs that are not available to the commercial market-even with identically labeled pistols (i.e., the "M" models) .
Best, Jon