David's volunteer tomatoes were F2 hybrids (the tastier ones from the previous year were F1 hybrids), simplysue's are heirlooms.
I'd be much more likely to kill the progeny of hybrid tomatoes, than heirlooms: David's
experience is very common, because most hybrid tomatoes have a cherry tomato parent, and most mainstream tomatoes are F1 hybrids.
Heirloom seeds, by definition, will breed true. Seed catalogs that trumpet "open-pollinated" are promising that saved seed will be reasonably similar to what you originally bought.
Soil is absolutely right that, by using seed that grew where you will plant it, you naturally select for stock that grows well there. Done for enough years, and perhaps with input from other varieties, you end up with a related group of plants called a "
landrace."
Seeds that constitute a
landrace will include a mix of genes that proved adaptive in extreme years, and normal years. They will be much, much less responsive to perfect conditions than "green revolution" style seeds, but tend to be a lot less vulnerable to problems with weather, disease, etc.
So from less to more permacultural, I see a spectrum:
"terminator" seeds < hybrids < new, open-pollinated varieties < heirlooms < landrace
"the qualities of these bacteria, like the heat of the sun, electricity, or the qualities of metals, are part of the storehouse of knowledge of all men. They are manifestations of the laws of nature, free to all men and reserved exclusively to none." SCOTUS, Funk Bros. Seed Co. v. Kale Inoculant Co.