Unless you think that this is a giant conspiracy on the part of Honda, Toyota, GM, VW, Audi, Mercedes & BMW, I think you have to accept that these manufacturers see a need for a higher level of detergency in gasoline. Yes, some cars will run decently for a long time without those stronger detergents, just as some people can subsist for years on a junk food diet. However, it would be irresponsible for anyone to suggest that everyone should eat only junk food.
Before the easy availability of Top Tier gas, I used to use a bottle of Techron twice a year in order to prevent problems. Now that ~95% of the gas brands in my area are Top Tier certified, I would actually have to go out of my way to buy gas that isn’t Top Tier. As far as I know, the only gas brands in my neck of the woods that are not Top Tier are Gulf, Speedway, BJ’s, Sam’s Club, and the various unbranded stations.
Since my nearby Costco almost always charges less than any of those non-TT stations, Costco is my go-to place for gas. If I am on the road, I can use almost any name brand of gasoline and still get TT gas.