I think it's worth noting that this article is mainly about 'production nursery' techniques, i.e. producing plants for sale over a short time period.
Most people here are probably keeping plants in the same pots/media for longer periods, and the plant will grow and pull more water out as it gets bigger.
The drainage/waterholding issues will change under influence of the size of the plant growing in it.
That said, it has some good points about the structure of the lower strata of pot media, and not needing the NPK at the bottom of the pot.
As for myself I have found that the same pot media also behaves slightly differently seasonally, i.e. in hot weather. water holding/drainage/ watering requirements different than in cool weather.
I have used a screen to fine up the top layer of seed raising mix, and use the saved coarser particles lower in the pot. Not a 2 layer stratification, but similar ??
If using the exact same pot media, increasing the height of the pot effectively increases the air space of the mix, and lowers the saturated zone further below the root zone. Stratification aims to do this, but economically in reasonable sized pots for sale and shipment.