Funny though, we all implicitly buy into "QUIC is the new http/2" or whatever because fast = good without really understanding the details.
It's like buying the new 5G cell phone because it is X times faster than 4G even though 1) My 4G phone never actually ran at the full 4G speed and 2) The problem with any connection is almost never due to the line speed of my internet connection but a misbehaving DNS server/target website/connection Mux at my broadband provider. "But it's 5G"
Same thing cracks me up when people advertise "fibre broadband" for internet by showing people watching the TV like the wind is blowing in their hair, because that's how it works (not!). I used to stream on my 8Mb connection so 300Mb might be good for some things but I doubt I would notice much difference.