Why do you have to make work fun, shouldn't you already be enjoying it if you are doing what you want to do? Are you not doing what you want to do? See, that's the kind of problem that creates the infantilisation.
Is it reasonable to expect that everyone in every WFH-friendly job is actually "doing what they want to do" all the time? In my opinion, no way. Even for someone doing their dream job, parts of their day-to-day are guaranteed to be eaten up by objectively not-fun tasks.
Also, the fact that someone enjoys their job doesn't mean the experience can't be improved.
Also, the fact that someone enjoys their job doesn't mean the experience can't be improved.