I'm afraid you read but miscomprehend.
(1) I said potatoes have no real use in game when pitted against other crops.
-corn can be sold, best crop to compost
-pumpkins, best farmable produce for overall heals
-wheat=bread, best food for horses
-hemp is cloth!
-potatoes, ...... bad compost value, low healing, worse horse feed than bread. I might be missing nuances but it seems like just the worst crop to be farming for.
(2) worms are worse bait than grubs and the amount of work that goes into resetting traps so that they can trap again might not be worth it for everyone.
also, bad compost value! you can only stack 100 and they need quite a lot of them to even turn into 1 fertiliser!
(3) metal plates give only like 3 HQM... but yeah I guess your point can work.
But you did raise a good indirect point. Fish farmers and chicken egg farmers do need some love. However diluting the saleable pool too much without expanding the saleable items at a time just makes it more of a gamble than a market.