A good WIFI6 router can achieve 9xx odd mbps for download at near range. Think it is more than enough for most users. This is never ending, WIFI7 already another coming standard. Think WIFI6 enough for now until 2Gbps or faster fibre plan gets cheaper and then see what WIFIX router is available at reasonable price and get it then. For me, good coverage now more important than outright speed.
Good coverage on the 5Ghz band where the higher speeds are can never be provided by a single router.
The old practise of a single router in the house dates back to 2.4Ghz days, or 802.11n (ie, 300Mbps on 2T2R/40Mhz band). Of course this does not apply for people who live in Studio apartments or 2 room flats. For most of us who live in bigger places, even a 4 room flat requires at least a 2-node system imo, if not 3 nodes for optimal coverage if they desire the absolute best performance even with closed doors.
Going back to secondary school physics, lower frequency = lower speeds = higher penetrative power. That's why the 2.4Ghz frequency worked better to cover a larger area. The main caveat is that your neighbour's wifi signals also interfere with your own and vice-versa. Add the wireless doorbells, microwaves, remote controls, wireless keyboard+mouse, bluetooth and other devices all operating on the same 2.4Ghz spectrum, and it's very crowded and full of collision.
We want the high speeds, but that also means 5Ghz has poorer penetrative power. It was decent in the past, but with everyone moving to 5Ghz bands, it is also very crowded.
Hence, in urban-dense Singapore, the 6Ghz band is more important than we realise. It means less interference from your neighbour's wifi (since it has poorer penetrative power) and that means less collision and queueing (or I will colloqually use "
CSMA/CA" here even though the term CD strictly refers to wired cable collision detection/avoidance mechanisms), translating to improved network performance. The main caveat? That we will need more nodes to cover an apartment. Here you will see the lie that is mesh systems, since the mesh backbone will likely fall to the 5Ghz band (or even the 2.4Ghz band, as they have better penetration through walls) and that actually means a slow network even though the computer reports it is connected to the AP on Wifi 6E/7. Actual speeds will be the slowest, which means your backbone speed will severely limit overall network performance as long as we are on wireless mesh. Those who invested in wired networks will have much better network performance overall.
Then there's also the wrong practise of boosting wifi power, thinking that that improves range, which is untrue when all things are considered. Remember wireless communication is 2-way. Your router may reach your device, but your battery-powered device may not have enough power to transmit back to the router, or it may need to draw more power to boost the signal to successfully retransmit back. Both are not good things. The best practise is to keep the power output just high enough for your home, and if you have multiple nodes, high enough to cover the zones they are meant to cover, so that handover to another AP can be negotiated properly. This is also good neighbourly practise, because if everyone does it, there will also be less interference from other neighbours and leads to lower "CSMA".
For those of us who might have greater demands on our home network for whatever reasons (eg, working off your NAS for photos/videos editing), Wifi6 is not sufficient.
