When does a gimmick become a dynamic element beyond an arbitrary limit of how much people like it? Buzzwords can be pretty harmful in a discussion because people don't all have the same definition for it (and they also don't dig any deeper than the surface). The literal definition of a gimmick means that it's something added to something solely for the purpose of attracting attention, but a lot of other connotations have been tacked on just by way that language works.
Instead of using buzzwords, just call things what they are. Dig deeper, too. Instead of calling a dynamic element a gimmick, state that the dynamic element doesn't contribute anything meaningful to the map. Explain why, too! Does the element simply not change the gameplay of the map at all? Is it frustrating to use? Can the element be abused by certain classes to gain an unfair/unfun advantage? Would another less "gimmicky" element do the same job more effectively? Asking these sorts of questions is the first step in making good design choices.
Instead of using buzzwords, just call things what they are. Dig deeper, too. Instead of calling a dynamic element a gimmick, state that the dynamic element doesn't contribute anything meaningful to the map. Explain why, too! Does the element simply not change the gameplay of the map at all? Is it frustrating to use? Can the element be abused by certain classes to gain an unfair/unfun advantage? Would another less "gimmicky" element do the same job more effectively? Asking these sorts of questions is the first step in making good design choices.