They bring in too many resources. This is very unbalanced.
- Make an option in the settings or a rule for expert mods so that jewelers, metalworkers keep significantly less resources, so that the maximum items they can give the player per interaction would be 10 times less for gems and 6 times less for metals.
Thus, players who are interested in the survival and cave exploration aspect will always need to earn all these resources on their own.
- Also, villagers who use ovens bring a lot of high-level products like fruit pie. I suggest making it an option and rule for expert mods so that villagers cannot cook pies.
This way, players will have to go to their farms from time to time, where they can safely collect ingredients for their own pies.
This will be a relaxing change for players who have just come from the caves, where they have been stressed out fighting skeletons, extreme temperatures, and trying not to fall into lava.