I really enjoy playing other variants! They are much more fun to play, not all that theory, GTO and solver stuff. Sure, there is an optimal play, but theory for them right now is not as mechanical as hold'em tends to be. Maybe someday we will see solvers for them as well, specially because many of them are fixed limit games, and fixed bet sizes reduce the amount of choices, making it easier to solve, but for right now, when I want to have fun, mixed games are my first choice.
Also, people don't know much what they are doing at the table, one who studies can have a decent win rate if they can find good soft games. Specially when there are series in Pokerstars, people are just crazy in other variants.
And I strongly believe that they made me play better Hold'em as well. Because you start to grasp core poker concepts, not only to play your two cards.