Blood Fish & Bone v Growmore

"We'll have to wait and see what becomes of it."

They will be fine! The exact constituents of fertilizer, within reason (balanced trace elements, for example), is a bit hair-splitting.

However, I am mindful that when I was growing stuff (commercially) using in hydroponics, and we provided perfectly balanced and optimised nutrients for the plants (had a bunch of scientific bods and lots of fancy / expensive equipment that could do the Full Forensics!) the plants would selectively STRIP one of the major nutrients out of the solution in just a few hours when they were hungry - e.g. when the first truss set. So I think it is fair to say that providing for the "need" is important, just that with soil there is a decent reservoir of nutrients, although with container / bag grown less so - and for certain with hydroponics MUCH less so.