I’m going to be a weasel and agree/disagree with the OP.
First the agree - my homemade burgers are hands down better than most of the burgers at the “kids” end of the fast-food train. McDonalds being the absolute worst, with BK and Wendy’s being up near the top of this section.
The next level is the ‘big kids’ / adult fast food burgers, such as 5 guys and the like, and I’d put my homemade burgers at better, but with a much smaller margin in terms of the burger, but still rocking ahead on condiments, seasoning, bun, etc.
Past that, most chains that serve burgers, serve them as a part of a larger menu, the whole Chili’s, Red Robin, etc. Their burgers honestly aren’t any better, but then again, they don’t make them the main focus of their menu.
Now, for some of the exceptions - local chains. I am a huge fan of the New Mexico based chain Lotaburger. They do traditional fresh meat patties on a huge griddle, up to a few dozen at a time, buns on the griddle, with New Mexico green chile for the asking. They are one of the things I miss most about living in Albuquerque and Las Cruces.
The Owl Cafe in Albuquerque is another ‘chain’ although only the original location in San Antonio is involved in the chain, and they too do amazing green chile cheeseburgers, although with a much more heavily seasoned beef patty.
Despite years of trying, I haven’t been able to fully equal either, but my feeling is that it boils down to a few things, that may also apply to what others crave from the chains. One, they can get their patties thinner than I manage without overworking the meat, then cook them fast and hot on a huge griddle, which I cannot fully replicate at home. This leaves the meat more tender, with less fat loss to the pan, and less chance to overcook. The last thing I suspect, but cannot prove they do, is the one that I bet makes us sometimes crave Fast Food burgers, and that is they probably salt the hell out of it.
A former full time cook I know ( worked at a local chop house, so not super high end, but made solid wages, far more than the min wage fry guys mentioned before) always said ‘when in doubt, add salt’. And he was right, the closest I’ve found to the taste of a FF burger when I cooked it was to salt the hell out of it during forming. And it tastes . . . better? Not really salty, but more meaty and flavorful.
So that’s it from me. I can cook a damn good burger, with great toppings and condiments, on a fresh baked bun. But if I want it to taste great, or taste like it came from a great burger joint, it’s all about a ton of salt.