You absolutely can farm on three acres.

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Well, I won't argue that point. My bet is that it'll never be used as a farm. Since we're in a rental housing crisis, I'm thinking about the number of two family homes that could be built on those 3 acres.

In MA, there are cities and towns where you can build a two family on 10000 sf or maybe less. There should be at least one zone in every city and town in Maine with similar zoning. If Mainers wanted to retain the bucolic look of Maine, they could zone the rest of the city or town the way it's always been. Just think of what would happen if every town within an hour's drive of Portland had two acres of it's land zoned for 2 family homes on 10,000 sf lot? You'd have an affordable owner occupied home AND an apartment to help that homeowner pay the mortgage.