Guild Wars 2

If They had all their traits active, not just 3 lines but all of them, but still with the same amount of utilities and weapon sets

I’d go with mesmer. If you take the condi road, a Chronophantasma-Mistrust-Ineptitude-Power Block build with a thousand condi clears, blinds, stab and boon strip seems pretty deadly to me.

we have 5 core trait lines, 1 elite trait line.
each trait line got 3 minor traits and 9 major traits.

are you talking about what happens when a profession has all access to
18 minor traits
54 major traits

???

seems like fun mode.
probably would crash the servers.

ele or mesmer i guess

Ele with the tons of defensive traits combined is very hard to kill and has a lot of healing