I love the OT client project, and would really love to see more people use it.
BUT, if the server doesn't have different sprites or any setting options than the traditional client, there is no reason to use the OTC.
With the OTC, there is so much we can do with it, such as removing awful 'additions' to the client such as ambient light, aimbot style hotkeys, and even lesser things like the exp bars.. and hey, not even going to lie, there was a big deal about the exp bars being added into the game when they were added, alot of people felt it removed the 'achievement' feeling of leveling or skilling up, and made the game more 'power game focused'.. and I do feel the additions of the exp bars really helped motivate people to play just to gain exp, rather than play for the roleplaying feel..
and you can add in additional skill bars for 'custom' skills bars, and really go all out with gathering and crafting skills..
But.. most times when I see the OTC client being used, there is just a hand full of sprites added in, and almost no actual client changes (outside of the minimap features that were added in by default for the OTC).. so much potential with it, and very little being done
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In case of that It would be my fault. I know many AMAZING developers like Admin Death and Slirpa(xagul) not touching OTC cause its still broken as fuck.
Death messed around a bit with the OTC a couple months back in the really raw alpha 'XDC' project, but he really didn't do anything to it that the traditional client didn't have.
Xagulz has expressed interest in using it, so he could update to the newest client verison (as a base), but peoples mass love of elfbot stops him from doing that.