I don't understand. Domestication is defined by the significant genetic changes induced by selective breeding. It's been practiced around the world, long before the industrial and scientific revolutions. For instance, pre-Colombian maize looks dramatically different than it's wild ancestor due to thousands of years of selective breeding.
They don't stock them, because growers don't plant them, because they don't transport or store well. More sugar means rots faster. Also, there's an enzyme(?) that forms just as the fruit ripens and gets tasty, that lets the skin split. So they pick them green, before either of those things happen.
There was a gene added that stopped the skin-split effect, so you could let them ripen and still transport them, but anti-GMO folk won't let us have them?
Tomatoes were only brought to Europe a few hundred years ago. I very much doubt that there was much serious breeding before that.
And there are loads that taste good, the supermarkets simply won't stock them because they make less money.