Largely “overhyped”. VERY individual. Consider: how hard you train, proximity to failure, number of off days, working volume, recovery, sleep, nutrition, stress, etc….can’t be the same formula for everyone. So people will NEVER need to really periodize.

The most important variable to periodize is volume. Mostly is done with longer periods of “traditional” programming, and shorter recovery phases.
The next most changed variable is proximity to failure.

Occasional “relearning” phases can have a place as well. Where the main focus is form and execution. (Effort is only as useful as it is well directed)