There's a farmers market here in Zurich where some Italians drive up and sell Italian products like cheeses, sausages, etc. but one thing I buy from them I've never seen anywhere else - they are rotten salted anchovies packed with peppercorns. Stink super bad and are falling apart but when you're making a sauce you drop one in and the anchovy dissolves and delivers tons of umami - glutamates - and you no longer smell…
I mean, instead of investing so much effort to get glutamate into your food, why not use MSG directly? Sounds like much less hassle? Reminds me of the time when Big Food over here in Germany replaced MSG with "yeast extract" so they could claim that their foods contained no artificial flavor enhancers (although the yeast extract also contains a lot of glutamate).
Because the various uammi sources also add other flavors. I like being able to choose between soy sauce, fish sauce, worcestershire sauce, soy bean paste, mushroom powder, anchovies, chicken powder, yeast extract, and, yes, msg (with 2% i&g) because each of them affects the recipe i'm working with differently. Is your diet nothing but chicken breast, raw flour and shortening because they're the simplest sources of protein, carbs and fat?