When I was younger (like 19-25) I worked occasionally for my father-in-law who had an iron working business. I'd walk the steel beams on new construction (15+ stories) with no issues. Something changed, because starting when I was in my 40s I absolutely freeze when I'm faced with a height situation like a balcony, exterior glass elevator, roof, etc. Anything above 2 stories and I've putty. LOL.
There's gotta be something to this. Heights were never a thing for me up until recently. When I was 16, I hung off ladders on second story roofs painting window frames like it was no big deal. I've been skydiving 3 times, most recent outing was about 6 years ago. Last summer I could barely muster the courage to climb up to my second story to nail some flashing down. A 30-second task took me 6-7 attempts of only making it half way up. I'm no longer wild about roller coasters either, but I think it's more so due to how they beat up the body and throw my stomach around.
I'm not a fan of heights, but I have been skydiving twice. Once I jumped solo. I can get past the fear if I knows it's "safe". My mom would go up on angled roof, prop a ladder against a palm tree and climb to the top of the ladder to put Christmas lights up. I would skydive 100 times before I do that again.
Those glass bottom features offer the sense of height, but it's mind over matter. I'll admit I've felt a slight bit uneasy, but I overall know the fact I'm safe. I've laid down on those, and even jumped. Now on the top of Half Dome, on the "diving board" looking down 3K+ feet, no safety railing, no safety net, the wind blowing... that makes one breathe a little different.