You could thaw it out, break it down, season it and re-form it. But who does that?
The salt mixed into many pre-made patties makes them increasingly rubbery the longer they sit in the supermarket. The seasonings are usually a crapshoot.
Toppings are a separate matter. Go to town.
There's a whole lot of seasoning going on with well cooked ground beef. When you go to a restaurant and the burgers pop -- this is why.
The most basic seasoning is salt. Unseasoned beef doesn't taste great and when it's cooked less than ideally often excess condiments are used to make up for the lack of seasoning.
When I cook burgers at home I often mix in diced garlic, a tiny bit of soy sauce, cayenne, msg, and rosemary.
One of my kids went through a phase of eating burgers with no toppings at all. Another, noodles with no sauce. It's a preference, but - if the topic is quality of cuisine it shouldn't be surprising that people have higher expectations.