I've weighed-in on this before in other threads.
First, we all have our own use cases, so tempered glass is a wonderful product for many users.
For me, I am particular about the aesthetic qualities of my phone, so for instance I don't tend to put elegantly-designed phones in cases so large they look like mini shoe boxes. Rather, I go for minimal cases that allow me to enjoy the excellent design of my phone.
Same for screen protectors. I find tempered glass protectors to typically be eye-sores. I can usually see a tempered glass protector on someones phone from 6 feet away. They typically look like what they are: a plate of glass on top of a plate of glass, but with exposed edges that are clearly defined, often with a white/hazy color. Often, since glass doesn't do well going around edges, these glass protectors don't cover the entire screen, further standing out. IMO, these edges are visually distracting, shouting "Hey, I have a smaller plate of glass on top of my plate of glass".
In short, I think they look horrible.
Film protectors are obviously less protective, and don't provide a perfectly glass-like surface. But, they always protect my screens 100% from scratches, they can feel like a lot like glass, they can cover 100% of the screen edge-to-edge, and just as importantly, they can be almost invisible - even right up close. Honestly, I just don't understand the tempered glass craze of the past few years.
All that said, I just bought two brands of film, and one brand of glass - just to try glass yet again.