Just adding “more things” won’t be the best solution, which is thankfully why Nelson has confirmed he wants to implement new and advanced farming mechanics such as irrigation systems, as well as some degree of automation.
In addition, it’s implied that in UII plants will actually need things like sunlight and water to grow.
(Interestingly, another confirmed upcoming feature related to farming is being able to grow your own dyes so that’s cool too?)
Also, in response to OP’s suggestions, I think it wouldn’t be out of place to find a regular tractor in a farm, so having things such as simple plows and harvesters you could pull behind it would be alright by me (maybe even a full combine harvester could be found in only the largest of farms). Just nothing too over the top.