I live two counties over from Tomato Capitol or Grainger County, Tennessee. At first they were good. Then the alternations began. Now even when they should be fresh you can almost use them for a baseball and they have all the juiciness of a cotton ball. That was just one of many things that simply no longer taste as good as they once did. Bread is another thing. It all taste like it's stale. I'm almost 55 and I remember bakery fresh bread in stores. I can remember Bologna that did not cause extreme gastro calamity as today's product which causes one to bend over doubled in pain 10 minutes after ingestion.
Can’t argue about commercial tomatoes. An exception, if you can find them, are Campari cherry tomatoes, some of which are about the size of a Fourth-Of-July tomato. They taste like tomatoes, all year long. They breed true from the seed of the store-bought ones and can be grown in a pot if you prune them a bit.
I’m older than you. Store bought bread is, IMO, better now than back in 1950, when store-bought meant Wonder Bread or something like it.
Bologna depends, again, IMO, on the brand. Some is truly gut-wrenching and some is not. Sandwich types are worse than ring types. I really can’t taste or otherwise experience any difference in the top brands over even 50 years ago.
But, you can always bake bread and switch to hard salami (Genoa) for sandwiches.