Those are fine. I mean the short-term stuff, like the sauces that come with takeout, or garnishes you made for a specific dish and you finished the dish but there's still more of the garnish.
Personally I use those to test for the presence of mold. Great success so far!
But yeah, I get what you mean. I’ve had to be the Bad Guy who throws out the 14,000+ cups of tartar sauce and soy sauce that take up as much space as the rest of the takeout that has long since been eaten.
Good point about condiments, those really tend to accumulate in fridges for years. Sometimes I just don't shop for a few weeks and try to use up all the food at home.