In my experience the liquid stuff like Envii is more of a supplement than a feed. I've experimented using just Envii and adult plants have struggled, I suspect that not enough of the macro NPKS nutrients at the concentrations that would be affordable for me. That said, I still use it as a foliar spray and often throw a splash in watering cans on days between 'feeds'. One thing I notice is that when used as a foliar spray I can see the residue once the leaves have dried and wonder if this might slightly reduce the amount of sunlight getting through (like dirty windows do!). I doubt it's an issue outdoors as rain will wash it off again but under glass it might build up?
