If you read through the thread a lot of people that voted yes were on the older servers. They seemed to think that cross server Sage would make it so F2P would fight more balanced battles. People told them that Oasis doesn't exactly have a track record with good matchmaking (see: Arena/Matsuri) but of course they didn't listen.
And here we are. Me personally, cross server Sage is great since I still sweep with 15+ winning streaks since my BP is so high, but it probably wasn't that fun for other lvl 60-75's running across a Susano brother team / Ayhole lightning blitz team.