My primary point is that IMHO "Golf" does literally nothing, and yet everyone uses it.
No one could reasonably suggest that any one system is always the best in all situations. Generally in the USA, for most things in life, the outside world gets little consideration so 'N' is rarely considered of value. Not so in Europe where there is a much greater mix of nationalities both visiting and also based here. So, the 'N' or 'F' or 'PH' or 'D' etc also helps to narrow things down a mite. If you consider that adding a colour or a type is of value in a particular situation then do so, sometimes it is helpful but at other times it isn't. Helicopters, as pointed out, in accordance with best practice, rarely fly the same circuit, join at a different point and touch down mid runway owing to vortex.
Change the system OK but don't expect to change things of consequence. A lot of fiddling around with little or no gain. In all the incidence that I've debriefed over the years I cannot recall a single incidence where a specific call sign would have made any difference. Failing to fly an accurate circuit, a good look out and a failure to adjust speed to the circuit norms cover most incidents. NEVER assume your number 2 or 3 or 4 unless the circuit is managed by a qualified ATC.