I think a lot of the plexi-rage is pretty valid, because its symbolic of Uni (and Disney's) profoundly unserious approach to a deadly pandemic.
We have a solution, one that all but ends the crisis that has killed hundreds of thousands and cratered the economy. Vaccines. Mandate them for employees and guests. Use the massive power and staggering resources of two of the biggest entertainment corporations to lead. Dare the government to go to war with the theme park industry.
If this causes a shortage of talent, fine. Adapt. But the shortage likely won't be that bad - people scream and kick, but when employers require vaccination, they get vaccinated. HHN is a unique employment situation, but I still feel quite sure you won't lose that many scareactors.
But the fact is, Disney and Uni look at the current political situation and they're terrified. Layers of managers shudder to pick a fight. So we're stuck with theatre, plexiglass that lessens the event, doesn't help with the crisis, and may actually make things worse.
At least Disney is requiring guests use masks. Universal lacks even that courage.
Honestly, that plexiglass is a striking reminder of craven corporate cowardice.