Streaming, downloading multi-GB files like games or HD movies, playing games online while avoiding (at least some) latency, uploading content or hosting your own file-sharing servers.

It's not just a speed problem. Within the Tor community I personally still see a lot of people saying that behaviors like these are selfish because they take up too many volunteer resources. Maybe it's a little unfair of me, maybe those people are misinformed -- but I interpret that as meaning that the community doesn't think Tor can scale to meet those demands.

With either a 3rd-party or a self-hosted VPN, you can reroute literally all of your network traffic from all of your devices without giving it any thought, and the only time you'll really need to get off is if you're accessing a blocked website or doing something that demands very low latency.