I think this is because you are hanging with cookie cutter peeps. I have run pure air mage, pure sun, pure water, pure death as well life. you do require always other options outside of just one school to do everything as you always need heals to keep alive or a heck of a lot of health. As to melee, all melee are viable... even with fists. I have even killed a boss with just anks in my hand and wands. you can also solo in cloth just as easy as plate.. you are right most mages will wear heavy to get added protection and HP. some invest heavy to bring fizzle down enough to wear almost full plate yet they are still mages. There is a lot of gear and skills that you can work in to decks to offset your fizzle. As I said most people will see someone doing something and just copy them. this is why the top players keep to themselves their builds. If you download a meter like sota assist etc then you can start to test things on your own. or start to look at all the skills and think about the logic behind each and you will find a lot of neat things people dont think of which are like hidden gems when you find them. The other reason some keep there build to themselves is if too many figure out through testing / math things that could be OP they dont want all to get it or it may be looked at too powerful and nerfed. look at archery... in 6 months there was few to so many people playing that one cookie cutter build... they all copied it. its all math in the end.