I have heard the same. I don't feed in soil the first couple weeks because soil has the food there. Coco is empty, therefore you need to be feeding from the start.
I have had a couple plants that were a little nute sensitive, but the vast majority I treat like photos, increase feed till tipburn, and back off 10%. Many strains I have found I can push well over 100%. A couple strains were very happy at almost 200% of recommended feed levels. So I would suggest that is about as true as "you can't top autos".
The original ruderelous can grow in a ditch full of sand and rocks with some rain once in a while (but I don't want to smoke it!)... I think the farther we move away from the original genetic package, the less like the original they act, if that makes sence.
I run coco sometimes, love the growth and weight. Makes feeding a breeze since you can't overwater. Problems easy to solve... use it if I need the weight moving thru for some reason.
We almost all try and get started with a couple bucks and a couple seeds. Good weed comes from good genetics, grown with good nutes in a quality medium (soil or soiless) with good lighting, in a balanced environment. None of those things are just a couple bucks!
Sunshine #4 or Nectar for the Gods #4 soil is what I run. If I watch I can find it for 15-17$ a bag (us).
Shoulda seen my first grow... bagseed under stolen security lights in Miricle grow... with fish emulsion for fertz...blah! So bad you couldn't share it... good times!