In a recent survey of professional coco growers, 20% used it alone, and 80% used it as over 70% of their mix. Just as many coco users were using just 10-20% coco, so are outside the count of coco growers.
That's 4 out of 5 coco growers, not actually coco growers, if we want to be pedantic. Of the 1 in 5 that do use coco (which is all I can address with blanket statements about coco) we still have them falling into different grades.
This thread seems to be the c4c guidance. A constantly wet method, with the low air and pithium risks that brings. Cannabis loves air.
Here is canna's take on things, for balance
https://www.cannagardening.com/using_canna_coco
Another somewhat expected quote
Here is a brand we see, and it's 4 grades listed for air and water retention
Specially chosen particles sizes and coco chips to create the optimum environment for tomato plants depending on grower preference and local climates.
www.botanicoir.com