What's the reasoning behind root juice up until harvest ?

I would expect root juice to be mainly beneficial from veg to mid flowering and then decrease or stop nutes and root juice and add in bloom stimulators .

I've got in root juice for my next grow and it says run right through to harvest ......

Seems like diminishing returns at that point ?

I'm still newb on growing.....

Roots at this point should be well established and nutrients are being flushed so what's the purpose of boosting the roots ....

Cheers

Why does it say use up to harvest? So you run out quicker and buy more.