>>21659294
Cubes are much smaller than the tbsp of goop. Both are meant to flavor multiple cups of water, so for the smaller one (the cube), the salt and msg concentration needs to be more. Also, they act as a cheap preservative. You can expose the cubes into air and they'll still last a while. The goop is more expensive, and can be left outside until you open the jar and have to put it in the fridge. This means the way they preserve the goop is more costly than just dumping a shit ton of salt and drying the goop into a powder. They would have to make the goop and jar it in a perfectly sanitized environment, since opening the jar removes this sanitation assurance. Drying out a powder already sanitizes by removing all water.
As a goop, more complex flavors are better preserved dissolved in the liquid. Powder cubes are naturally inferior.