OK, so you have two of those going and a twitch stream, someone's downloading a new game as well (and wants it now not in two hours), plus a bunch of other things going on... it adds up and it's good to have the burst capacity for large downloads when you want it.
> I never could for the life of me convince steam/epic/whatever to give me more than roughly 50MBps.
Did you mean bits or bytes there? 50 MBps == 400Mbps.
I regularly get several hundred Mbps out of the game services like steam here in the UK... wonder what's different?
FYI Amazon/netflix give a minimum of 25Mbps for a 4K stream and it seems to be recommended that you have at least 25% over that for a "good" experience. The streams are HDR as well as 4K which might explain why that's so high. If 8K gets established, we're likely talking about 100Mbps just for one stream.