Have a look at serious training
sans powermeter.
It is effective, no one, and certainly not me, are claiming otherwise. The sessions, the micro/macro cycles don't really change whether you have a PM or not.
However, those who are serious about training log things like:- time, distance, speed (if applicable), VAM, HR, RPE, mood, fatigue, weighted session intensity (various way of doing this), waking HR, pre-sleep HR, body weight, recovery, sleep duration, estimated calorie expenditure/intake etc. May not be all of these, but certainly a lot of them.
Riding on feel, and giving up a power meter if you had one, as I said before, basically says, "I am not serious about training." Which is fine. Not everyone is. But own that choice that you are settling for a lesser path.
"Physiology is all just propaganda and lies... all waiting to be disproven by the next study."
"I'm not a real doctor; But I am a real worm; I am an actual worm." - TMBG