Why is there a delay whilst I am streaming on my Xbox One to Twitch? (since mixer is gone)

mixer was and is still like that unless you use the other low latency option, but then if your net aint good you would definately notice it.

twitch always has a delay like so many others, you get used to it after a while and everyone that watches twitch understands the delay .

If I remember correctly, Twitch has always been like that. As for streaming from twitch to YouTube, no you cannot do that on the Xbox One. I don't know if Twitch still do this, but on the website twitch.tv, there was an option to upload your broadcast
to YouTube after you had finished. The option might still be there.

So it shouldn't be delayed after I stop streaming? It just happens while I'm live....that's fine if that's the case. And yes the option to export the video to YouTube remains.

Well, I don't stream but I do watch other streamers. Some of my friends are streamers. Some prefer Mixer (the majority) and some Twitch.

I prefer Mixer streams myself since there is almost no delay with the chat. Twitch has a very annoying delay and when you chat, the streamer needs to remember his conversation and your response in order not to cause confusion

So how can xbox user stream since mixer will be gone here soon?

just install twitch app and stream with that, thats what we all used before mixer.