Overall, I agree it's obvious the game is not balanced for 1v1, but I'd like to point out it's still relevant as some people might go alone to capture opponent's base, meet someone in the process, you are 1v1 then, and once you're on the base, you often have someone keeping it, or just someone who died recently and just came back to live and come at you because you're capturing their base. Knowing your class can or cannot be good at that kind of thing (1v1) is then relevant or you'll just waste your time and your team time as well.
It's still not balanced for it, but if you are good at it with a good class, you can even 1v2 some people keeping a base (it's a bit harder now with potions, tho).
And when you see a whole opponent team taking time to come back to base to recapture it, you might give a fair advantage to your team beating the rest of their team.

I mean, overall, it does happen, even if you don't do it, some others do. So it's better having them good at it, even if it's not an optimal strat.