Also, not feeding a stressed or brand new plant.
I disagree with this. It's like not feeding a sick person or a brand new baby because they still have fat on their bones. Plants can
survive on water and air alone. But if it's growth and health you're after, they're going to need those building blocks they produce from fertilizer.
We humans tend to over-feed plants a lot, which hurts their root systems and can make things worse. Most of those issues however, have been caused by the grower itself and will continue to persist whether the plants are fed or not. The key is to not give a dose that'll damage the plant, and that's a general guideline that applies to even healthy plants. A light dose of fertilizer can really do no harm, if that person knows what he/she is doing.
The idea that a plant needs to recover without fertilizer always gets me a little cramped up, it's truly a (bonsai) myth. Scientists all around the world agree that plants hardly grow if they aren't supplied with nutrients. No growth = no recovery.
How is it supposed to build and add, if there's only carbon available? They need nitrogen to build their chlorophyll, enzymes and proteins, phosphorous for DNA and ATP (energy cycle), potassium for energy, signaling and producing and using proteins. A plant can recycle those that it has already taken up in the past, but this involves taking it from already existing structures by breaking those down.
I like to use the house construction analogy: If it takes 400 bricks to build a wall, you can only build two walls with 800 bricks. Or you can build four walls half the size, eight walls a quarter of their size, and so on. But if you want your house to have a roof that you don't bump into, you're going to need to add bricks, a whole lot of them. Renovating a house that has fallen apart, is extremely difficult if you use only the materials that are already there. Even stapling wall paper back to a wall requires new staples.
If weak plants have to destroy what they have built, in order to build more of the same weak structures.. They're going to have a problem that perpetuates. I have the feeling that we as caretakers should break that cycle and go for prime health.
I'm willing to debate anyone who disagrees. Because it simply isn't a debate.