Then it changes dating a lot. Before, you often people from your extended social circle. You met people at your hobbies, at uni or even work, or when going out. You could ask common acquaintances to check someone out. And you had at least some kind of social connection.
And dating apps remove all ambiguity. You are not in an innocent everyday situation where you happen to like somebody, you start flirting and you move closer and see what happens. It is clear from the beginning that you are both there looking for something. I would find that immensely stressful, everything becomes a performance. I can't flirt "on cue" and I've heard the same from other people.
I wonder how modern dating would look like if the financial incentives of the app company was not the main driver. Maybe you'd have some "neutral" social network that people use IRL where dating was just an emergent side function? But maybe I'm biased because that's how online dating looked like in my early 20s?