I think the 9mm 1.0s put a bad taste in a lot of people’s mouths. Given that it was supposed to be a much improved Glock and then ultimately ended up just not being that, it kinda got dropped like a bad habit apart from a dedicated user base. Obviously the .40 and .45 variants were just peachy and the Shields didn’t exactly suck either (when they finally got rid of the thumb safety anywho). Between the lackluster release of the 2.0s and S&W’s generally somewhat questionable QC I think a lot of people did a hard pass on the update in favor of other options that were coming out or were out at the time.
If the 2.0s truly are what the 1.0s should have been, then I may very well never go out of my way to buy another Glock again, despite GSSF discounts.