Consider a new user with a desire to set up their home network using OpenWrt with a regular LAN, a guest Network and a separate network for their 3 gaming devices. Should we tell them to spend more money for an 8/64 device or go with less money and more features on a 16/128 device?
The reason to not get an 8/64 device is that you can get more suitable devices for either less money or just marginally more money depending on your local markets. These users are typically spending as much as the cost of a router per month on the service, and they want some nontrivial performance. We routinely get questions here about running SQM on 200Mbps + connections. It is bad to have people buy hardware that can't meet common performance needs and then need to throw it away and get the more performant device anyway. We are trying to communicate a set of recommendations that avoid this kind of waste. Buying say a 75 dollar 8/64 device that won't meet your needs and then having to upgrade to a $83 device that will... Not good compared to just getting the right device in the first place... I'm sure you agree here in this kind of circumstance. People should get appropriate expectations from the wiki and table of hardware etc