The 2.4Gbps phy rate is nowhere close to usable bandwidth. With wide channels, good reception, not too much interference, and no really old hardware interfering with your connection, you can get over 1gbps on it, but the theoretical maximum is irrelevant to most use cases.
In practice, most people don't have their routers set up for 160MHz bands (because older devices don't support it and will fall back to the much slower 2.4GHz otherwise) and in some areas near radars you can't even use those bands in the first place. However, with modern equipment, you can definitely get plenty of bandwidth over WiFi 6.
The 50Gbps number stated also assumes very wide channels and even more recent devices, if WiFi 6 isn't doing it for you today, WiFi 7 won't be that much better.