Its not years behind. That's a lie. In fact Id say it's ahead because you don't need to use a phone number (huge liability), you can choose to use e2e if you want and theyre not storing your data in plaintext!

Oh and all of matrix is totally open source! Wow. That's how you know you can trust it. If they decide to pull a WhatsApp and move to Facebook, you can just fork and get on with your life.

I like that the telegram client is open, but the sever isn't. Which means I don't really trust them. Same problem as Signal.