Personally, I'm rarely "surprised" by a need to play a specific game that I don't already have downloaded/installed so I can just tell Steam to download the game in advance. But if I were to be in such a surprise scenario, we're talking the difference between popping on one youtube video while I wait or popping on two youtube videos while I wait. In both scenarios, I am waiting for a small but not insignificant amount of time... now if we could get 10gbps that'd be a game changer. I wouldn't even context switch for a 2.6 minute wait.
[0] https://gameboost.com/blog/call-of-duty-bo7-download-size