I don’t care what kind of router or router mesh system you have, nothing beats gigabit Ethernet.
So I just tested this on my late 2014, 5K iMac. For reference, this is a gigabit ethernet-connected computer, with... gigabit Internet through CenturyLink. Gigabit up and gigabit down. So, from start to finish this is likely as good as it gets in the consumer market as of right now.
I tested a couple of games: Bioshock Infinite and Grim Dawn (just to pick a couple). Bioshock Infinite runs perfectly at 1440p (the highest res Steam would let me pick using Geforce NOW). Maxed out, ultra settings, no issues. No stutters, no jerks, nothing
Same goes for Grim Dawn. Everything cranked to MAX settings, settings that even in Boot Camp I couldn't hope to achieve with my M295X Radeon 4GB card.
Everything great, right?
Nope.
First, visual quality is nothing like 1440p on a 1440p/5K monitor. It's all a bit... soft. Not unbearable, of course. Still pretty. But text is soft, fine details are soft. All of it soft!
But the biggest problem is (STILL) latency. Even on a full gigabit connection, the latency is... well... bad. The games RUN perfectly, but the delay from moving the mouse around is highly noticeable if you've ever been a gamer in the past/currently. It has to be around 150ms input latency - I'd guess. Some gamers may not be bothered by this, but I know I am.
For a game like Grim Dawn (Diablo clone) you're probably thinking that doesn't probably matter, but it absolutely DOES. Picking up items is a bit of a chore because the mouse has that delay in movement that makes it hard to pick up small objects on the ground. Any game that requires precision mouse movement is just a pain. And FPSs just don't have that connected feel I have when playing on my 21ms LG OLED TV. I just feel disconnected from the experience, and that's a shame.
So, will this be a viable solution for some people? Absolutely. Is it a viable solution for me, or anyone "into" games. Not even slightly.