Agreed, but it is easy to mistake sensitivity to context for "contradicting yourself when it's politically convenient".

I'm not sure what instances of whataboutism you have seen. Almost all the ones I see are fallacious. It's very puzzling that you would report having never seen any.

Have you honestly not seen Trump supporters defending Trump's hiding of classified documents with "but Biden had classified documents too"? Independent of whether the critic had stated that what Biden was doing was okay, and without regard to the different context (repeated refusal to cooperate and repeated efforts to hide documents as opposed to immediate cooperation)?