There are some people who find it fun to be sparked with paddles. They are some people who can find fun in *anything*.
When people talk about 'what is fun' they are referring to what most people consider fun. Again, this isn't just a hypothetical - games design has been looking at this sort of stuff for *decades*. we *know* that certain things are much more likely to be perceived as enjoyable or fun by most people than others.
But thats all about what sells the most. By that logic monopoly is the most fun and by the logic of the video best board game ever designed, simply because a ton of people find it fun? If we end up in a place where we criticize games for not appealing enough to the masses we will soon loose any kind of interesting development in game design. The reason we have a ton of fantastic and deep board games today is because there where designers who dared to challenge what was perceived as "fun" such as roll and move etc.