Old Summoner mains are ticked off because the class went from a piano to an abacus with three beads in complexity. If you want to play the new version, fine but recognize that any success with the new version is pointless. It's a caster that doesn't cast more than Samurai. Would you like to eat your red skittle or your green skittle next? It's such a hard decision, you poor you. Truly a full and complete rework; any harder and heads may explode. No don't think too hard, that's dangerous! Maybe they'll need to change it so that the order of skittles is set because an suboptimal choice is currently still possible.
Full history of Summoner for context:
https://www.youtube.com/watch?v=qiD95kbP4Xo
As for tutorials, they are technically there beyond the Hall of Novices. It's what the class quests originally were beyond just setting lore. Unfortunately the introduction of the lower difficulty option made them redundant (arguably justified; the extensive reworks gutted tools that some of the class quests had been designed around ie Titan-egi tanking).