I’m the OP, and thought I should respond to all of you who were kind enough to give me your thoughts.
I know I could/should go and rent a Gen 5 but believe it or not, I’ve simply not had the time given my travel schedule for the past several months.
At any rate, given the majority of responses, and the fact that I have Gen 4 Glocks out the wazoo, and the finger grooves don’t bother me in the least, I’m sticking with what I’ve got. If it ain’t broke...
For the record I have Gen 4s in: 17, 19x2, 20, 23, 26, 29, 31, 32, 33 in numerical order. Hence my statement about being heavily invested.