I feel like I don't really know enough to say anything. I don't know if the choice of the TV vs. the glass is just for one show, or if it's the design of the tour in general. I also don't know the reason for the decision to use the TV.
Having said that, I can easily understand why people would be upset to get into the show and find a large TV on the stage. It's just my opinion, and one I'm not sure how many people share, but I think it gets back to the reason vocal synth concerts exist at all. Concerts exist to break the barrier between things that exist only as imagination and things that exist in reality. When people see characters they love, who've carried them positivity during difficult times, who connect them to others who feel similarly and do similar things as they all (real and imaginary) work together toward whatever better future they hope for, come to life on stage, it's a powerful experience. By bringing these characters into our world, turning one of the expectations of reality on its head, it converts what is hopelessly impossible into something hopeful.
The issue isn't really with the lack of the glass--it's the fact that people have seen TVs every day. They are a known thing that brings imagined things into one's home, but only within the confines of its frame. That's an understanding of TVs that, I'd imagine, every modern TV viewer accepts. So, rather than breaking the imaginary/real barrier, seeing a TV on stage reinforces it.
(I guess, as an aside, that's something I'd like to say to any vocal synth fan who is reading and is willing to accept the conceit of my sharing the opinion: when you go to a concert, don't forget why you came. It would be easy to get wrapped up in trivial things, getting distracted by...whatever. But if what I said before resonates with you...don't forget what's important.)
Having said all of that, I could readily understand why they might have chosen to use a TV, given the set design. With all the lights (which I imagine, given the superhero theme, might be drawing out a couple of buildings' worth of lines), it might've been seen as the best way to avoid having glare wash out the singers rather badly. It sure looks like there's a lot of light up there.
Also, according to facebook, tonight's venue only had 90 light sticks for sale.
The buying for purpose of reselling we saw a month or so ago might have contributed to that.