On twitch you can rewind as the stream goes on but you need to go to channel videos and play the newest one. Then it gives you the stream video until the point you click it. It then extends with the new stream footage when you reload the page.
But if you can't watch matches live then it should bother you because fb is the worst if you want to watch past matches :)
Qualitywise and with everything else fb is great, but these things I mentioned bothers me because I like to have option to pause it and go piss or make tea without waiting for match to end :D And it helps when I just can't make it to watch live from beginning but really want to watch it all