Is it easy to put too much variety in your soil? You mentioned treating it like a buffet, but say you use a decent amount of the down to earth products instead of just four of them will that be too much? I read that blood meal and bone meal isn't as good as alfalfa and fish meals, but I'd really like to have a variety of stuff in the soil if possible.
well, within reason sure, the key is to try and diversify but not overlap or be redundant, mix slow, med, and fast release of all the macros, and you are good.
an example would be this
for nitrogen i have multiple nutrients i use, fish meal, crab meal, alfalfa meal, steer manure, neem meal, shrimp meal.
but they each have different jobs.
the fish meal is a medium release nitrogen and provides all sorts of amino acids and encourages broad bacterial microbe diversity
crab meal is a slow release of nitrogen and phosphorus, provides chitin, is a liming nutrient, and also has calcium.
alfalfa meal is a fast/medium release of a modest NPK, but i use it more as a compost accelerant and a source for triacontranol (surely spelled wrong)
neem meal is sort of a secret weapon, as it's unique makeup adds much more than it's NPK value. Als adds sulfur
shrimp meal i use for the same reasons as crab meal, except it's available much faster
steer manure is probably the best macro "wildcard" as it has a great amount of macros (including sulfur), considering the amount you ca safely use in a mix the modest 1-1-1 goes a LONG way, and it all turns to pure humus as its used.
and it goes on and on, phosphorus, potassium, calcium, mag, etc
minerals don't typically need to be mixed much, with kelp and basalt the micros and minerals are taken care of pretty well.
My "secret" weapons are neem meal, and fresh comfrey. Those two i would not grow without, but that can be said for much of my inputs
Now, i feel it's probably worth mentioning that plants can grow with out alllll that, you can (I've done it personally" grow with verrrrrry minimal inputs
alpaca manure, kelp meal and langbeinite grew me some GREAT plants outside, it was my go to at my old house (knew a alpaca farmer)
rabbit manure I've also used.
but this method and technique i use now is the best I've tried
all predicated on fresh leaf/grass clipping compost though.