Some sites disabled pinch zooms (massively frustrating for images). Some sites exclude information in mobile view. I'm sure there's other reasons too.
Facebook, Reddit and Amazon all have terribly made mobile versions of their sites, for example.
Reddit's is comically bad, like they hired interns to make it who tried trendy stuff but didn't understand how to implement any of it properly.
I think it's intentionally bad. They just want to force you to use the app instead. Hence the 5 times a minute "Reddit is better in the app" popups too. Unfortunately the real reason of course is "Reddit can collect much more information about you if you use the app". It's not about "being better". That's a choice, if they wanted to provide a phenomenal web app experience they could easily do so.
Amusingly, I use my phone to magnify the labels for food ingredients to make sure myself or my kid aren't eating problem foods.
It is amazing how many years people live after their 40's and so much stuff is now "hard" and yet no one will design for it. Even when they themselves will inevitably suffer from it one day.
Exactly my thought. I too use it sometimes, but "always" is a bit too much.
Best are the blogs that have embedded images of graphs or something and they are as large as you can make them (edge to edge). Try pinch to zoom... nope. Tap on image... Here is a smaller version of the image (not edge to edge). Oooookay... Can I zoom now? Hahahhahah....nope!
I've always wondered why sites do this. What's the point of it? What does the web designer get from it?