What's Wrong with Only Having Support Abilities?

As the saying goes: Support roles stay the same, while tanks and carries come and go. Qin Mu has the [Ultimate Support System] bound to him, so in theory, he can only use support abilities. But... "You can split into countless clones and form an army all by yourself. How is that..." "I'm just increasing manpower. It's a support ability!" "And you crushed someone between two holy walls..." "That's a defensive skill, absolutely a support ability." "You punched straight through someone's chest..." "Hardening plus a speed boost. How is that not a support ability?" "..." Well, the System is perfectly respectable. It's just that its Host is a tiny bit odd. P.S. As always, it's a quick transmigration infinite-world story~