What do you mean, no desktop client support? There's a fully featured desktop client for Telegram, and I've never had my desktop clients have their sqlite database corrupt itself.
Telegram's native Mac app (https://macos.telegram.org/) supports E2E-encrypted secret chats. Their cross platform Qt-based app (https://desktop.telegram.org/) does not support this feature.
Notably, the experience in a Telegram secret chat behaves differently then regular chats. A secret chat is tied to one device; you can't start a secret chat on your phone and pick it up on your tablet/desktop. There's also no server-side message history. Regular (non-secret) chats don't have these limitations.
That's my only gripe. The rest of the app is incredible, and absolutely the most delightful app I use every day. I cite it often as an example of a native app that beats the pants off of anything Electron-based, it's just so damn fast.
> when avoiding Telegram's non-private conversations