Swisscom routers used to not have QoS at all, so it was a deal breaker.
Even so today, untangle or pfSense have way more functionalities. Untangle profiles for QoS priorities are amazing btw. Also all the firewalling rules (block all from RU and CN).
And for the gamers out there bufferbloat is a real issue.
Now, to be honest, most servers like Steam or Epic will not give you 10gpbs up so you won't fill the bandwidth so you won't have bufferbloat.
However in a house with Netflix 4k, some Twitch streams, 2 or 3 gamers and everyone downloading updates for Warzone, I can see the 10gpbs fill up and make some lag spikes for the ones gaming.
But yeah, after 3 months on 10gbps I realized that the internet is not ready for consumer 10gbps and the difference with 1gbps is not that big (except for Warzone 100GB DLs xD)