Boxing means you always have the option of dicking around just by yourself if thats what you want to do, without making you play a dedicated solo class. Its just a nice option. Personally if I can get away with NOT boxing I really prefer that as it is much more relaxing. But I would hate to be stuck with single boxing as only option forever, no thanks.
A single box enchanter is going to be way better at the job than a boxed one tho. I think lots of people would be happy to group with you... At least us in AG would be really happy to have you around.
I have a chanter in my main group, I have no problems adding another as my fourth. Boxing a chanter is not easy, especially when 3 seconds is the difference between a wipe or not.
I didnt read all replies ,, 6 pages lol. Anyway , if there had been option to choose 4 .. i would taken that .. But 3 is fine kinda .. So will vote for leave alone