60fps isn't even that good in video games, but so many gamers these days have been raised on 60Hz consoles and PC monitors. They don't remember the old days of CRTs, where 60Hz was painfully flickery, and you wanted at least 75Hz to relieve eye strain. 75 or 85Hz with corresponding fps was much slicker than 60Hz.

IMO the purists complaining about 48Hz are complaining about a subconscious association, perhaps a bit like the smell of popcorn in the lobby. It's not an objective complaint, but as a subjective one it may be shared by a large proportion of the audience. Hard to tell until someone takes the risk with a broad audience, like Jackson is doing here.