Telegram's secure chats do not sync across devices. A secret chat is one device to one other device. If you start one on your phone, you won't even see that it exists on your laptop or tablet.
Secret chats by default wouldn't make sense for telegram. It's not a secure messages app anymore... It's a social media platform with a secure chat feature.
Exactly: it's not a secure messenger. It has an option of secret chats which is not as private as Signal.
If you want privacy, use Signal. If you want UX, use Telegram. Just don't pretend Telegram is private. Both are fine, but people need to know what they are doing.
Secret chats by default wouldn't make sense for telegram. It's not a secure messages app anymore... It's a social media platform with a secure chat feature.