RO is the best thing I ever gave my plants. The crap that is in the water is in a crappy form for the plants to drink. I would much rather give my plants something in a form they can drink with ease.
I think you all are misunderstanding me. The pH of the RO is not very important if the alkalinity is close to nothing.
Anyway, just find me an article about why pH of RO is important, not about stability stuff.
If you feed your plants RO you will notice the runoff pH is the same as the medium pH, no matter what pH the RO is when you feed. Try it out.