Telegram has absolutely amazing UX on all platforms I've used it on, I hope they can roll out encryption for group chats soon and show somehow that we can trust that encryption.
The UI also looks like it was made by a intern who just learned how to use Android Studio, not like something new and cool. The actual text "Telegram" and a magnifying glass button instead of a search bar, hamburger menu instead of your own profile pic, no big fat QR scan icon, ...
2) hamburger menu is right here. the avatar-as-menu implies account details. the menu presented instead makes sense and has the stuff you'd expect.
3) magnifying bar makes sense since the real estate saved is used for useful information
4) there is a big fat qr scan icon. it's just not "first page material", which is the correct decision here. if abd when you need it, telegram tells you where to find it.
In any case, you are entitled to your assessment. I just completely disagree with it.
Why do you need your profile instead of a menu? Why a QR icon? Why a search bar?
Those are very minor things on an app that functions extremely well.