Ropers have similar disadvantage when they don't get to pick first. Someone could only pick artillery schemes (BnG, Hysteria and Aerial) or strategic schemes (Elite, Intermediate and Team17).
I agree though that you should be required to win different type of schemes in a playoff series. I've suggested before that you could only pick:
2 of BnG, Hysteria, Aerial
2 of Elite, Intermediate, Team17, Shopper
2 of TTRR, Roper, WxW, Big RR
This way you'd need to win 2 x artillery and 1 x strategic, for example. This should also make playoff series more enjoyable to watch. More variation and closer series.