What is best will always be open to discussion but how we each react is a personal decision and that decision will often be different for each tank. Some who determine that using the canister as the reactor is good, will do it regardless of what the prevailing experience from others says. Just a different mindset thing as some want to do it different, while others want to use the more reliable methods. No problems as we do each have a right to do our tanks as we choose.
It also helps keep a forum active as those who use mods on basic designs will often be coming back later to complain about how their design gives them trouble! An example of this is the Grigg's reactor, which many make small mods and find they have complaints. Certainly hard to get them to admit that it MIGHT be their mods which are the problem, rather than the Grigg's reactor? Always will be those who want to reinvent the wheel!
I find small cheap powerheads from E-bay to be one way to move CO2 as well as debris around the tank. They are cheap, versatile, and easy to maintain while giving me lots of choice on how and where to locate them to keep the debris moving along to the filter intake and while doing so, it moves the CO2. My large tanks all get several of the $7 ones to keep it moving and shaking the leaves.