If 2 Genres can be combined, Are they still incompatible?

Despite the controversy around the "Combine 2 incompatible genres (e.g. turn based racing)" theme, it made me wonder for a few days: "What genres are incompatible with each other?"

The example "turn based racing" doesn't help in my opinion. I think they are uncommon together but not incompatible. In racing, the goal is to reach the end line first (or within a time limit). If we make it turn based, then we need to pick in each turn the actions that will ensure we reach first after a number of turns (or within a limited number of steps or seconds). This may remove the need for quick reflexes which is common in racing (except if turns are timed), but I still think that this is a compatible combination.

What do you think?