No it's not irrelevant. Whether or not power delivery is relevant is entirely dependent on what you are doing with your PC. The same goes for whether or not it makes sense to overclock. It may be pointless to you but you don't speak for everyone.
Let me ask you:
How many AM4 systems have you built?
I don't know the exact number you are going to tell me, but I can be certain that your number will be less than me... by a lot.
Since Zen+, the boost algorithm is more efficient than a human at extracting the best performance, while running cooler and hence, quieter, so overclocking is a waste of time.
The power delivery even in most A320 boards will boost the CPU just fine.
People tend to forget than on AM3+, most boards were OK powering the 125W nominal of most FX CPUs, with only the ultra cheap boards being capable of only 95W CPUs. Those 125W nominal were in reality 160W socket, and the 95W nominal were 120W socket.
VRMs make a difference only in cases of a liquid cooled CPU with miserable system airflow where the MOSFETs and chokes of the power delivery are drown in their own heat.
That condition is academic, and if someone is experiencing it, then that person has bigger problems than the VRMs.
A lot of people got more obsessed with VRMs since a youtuber posted a video praising the AM4 boards of a specific brand.
That youtuber went as far as claiming "well, our board of choice doesn't have intel LAN, or alc1220 audio, or 2 m.2 slots, so if you are into those sort of things, maybe another board will work..."
That is not too different than claiming "our choice for race car has heavier duty suspension, but it is not faster than the others, so if you are into than sort of things like speed, maybe another car will work for you"