This kind of hits on why the concept of trying to make a "permanent World's Fair" had a fundamental flaw. World's Fairs (or Expos as they now call them) by their very ephemeral nature feature updated technology with each iteration. But with EPCOT, the march of technology inevitably overtakes the attractions and requires costly updates and overhauls to remain relevant. In theory, a park that constantly updated its attractions like that would be amazing, but we've seen over the past few decades how well that idea has(n't) played out.
And oddly enough, the one truly timeless attraction at EPCOT 1.0, Journey Into Imagination, that should have only required piecemeal up-dates as technology improved, was thoroughly butchered by its overhauls.