Arclight

Then lets go for 3.0, because it doesnt affect the old content at all, only adds new one... 1.9 and 2.1 has big difference, endgame with 50lvl and 55lvl is day a night difference. 40lvl twink can much more easily kill 50lvl guy than 45lvl twink can kill 55lvl one, both -10 difference but still, and we can discuss much longer for it, but this topic wasnt made to insult other people with saying "whats in your head", but vote YES or NO.

#3/3 I cant vote, it should be my 3rd post, so I should be able to now?

#2/3 Offtopic: Is it any chance to go 2.5 or 2.7 instead of 2.1 in future?

No, not yet, give it a little bit more time... atleast 3 months more and then update to 2.1.