A good question, but I am not saying that at all. 

The Plant Factory trees are high quality and undoubtedly will be great for closeups. They are as good as anything anyone can make with any procedural plant generator.

What I am saying is that some types of companies and individual people need trees or various plants that could appear in a very precise way. To get this, these trees need to be modelled exactly, in one or all details that matter to that person or company.  Think of the "home tree" in the movie Avatar. Or think of an advertising company that needs to make some gloious, high definition version of the central tree for the Amazon Kindle.

Or, think of a picture that you might want to make in Vue, whose central feature is going to be a very detailed knarly old apple tree learning against an old wall. That has very interesting and eye-catching twists and turns in it's bark.

To create this, you (or me, if I am the vendor), need to be able to take the "base model" tree from the plant generator, and do a lot of further design or texturing work on it in a modelling tool. That is, we need full modelling access to the plant.

It is not a simple matter of "high quality" versus "low quality." It is more a matter of hand-crafted and fully polished "hero plant" versus "Boy, I was able to generate this very fine plant for my scene, and look how well it came out!"  Does this make sense to you?