Should there be prior Enlisted insignia for Commissioned Officers?

I agree, the GCM suffices.

If one cannot identify a servicemember with 4 years of experience, (Resume Ribbons-Good Conduct, Leadership Course and other ribbons) on a 2LT who is about 26 years old they have issues.

I think its worth consideration

I was in favor of that in the 1960s

The only thing that those ribbons are good for is messing up the order of wear or possibly having to have new pins made up at super trouper. Besides when one observes a kiss butt in the unit looking like he single handedly won the war somewhere, it embarrassing to even add to your rack.

I couldn’t agree more. I always felt a true leader will usually distinguish themselves from others without “trying” to do so. As a leader, a true leader, your goal is not to stand out above your peers, or in this case to have more chest candy then the next.
It was always instilled into me as a prior enlisted, that once you become either an officer, a warrant officer, or a senior NCO that your ultimate goal was to leave that position or unit in which you were assigned to better than it was before you arrived. All of this will happen without trying to make it happen and will usually be seen by those above and below you without requiring some sort of identifier.

Precisely, and I also agree with the "chest candy" observation. When I realized that I retired with more ribbons than Admiral Chester W. Nimitz did (exclusive of foreign awards) without ever seeing a day of combat, I found it a bit embarrassing.

^^ so much this

What about the Good Conduct Ribbon?

Col S, 'on time, on target". Very good observation, obviously borne out of experience, sir!

If we were going to create a new award or insignia for officers, the only one that comes to mind would be a GSM (Good Sense Medal). This new award would rank immediately above the GCM, only 2LT or 1LT would be eligible to receive the award, although once it was awarded the recipient would continue to wear it throughout their career. The approving authority would be the the platoon sergeant or equivalent
senior NCO position immediately below the recipient in the chain of command with a minimum of 90 days continuous service in the position.