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Ok, I just want to make sure.
I think that most of the arguments you see from the pro-EC crowd show a desire to move UO forward technologically. The Gamebryo engine can simply do far more things than the Legacy engine can (I won't say "Wombat" here since that more the scripting code than the game engine), but as of right now is hampered in doing so BECAUSE of having to make it work in the 2d client as well.
That's one of the reasons why there's such a bad crash bug with the large explosion effect and poison traps in City of the Dead. The EC is using the same process to generate an effect that the CC uses. Instead of using one giant particle effect, it's using HUNDREDS of individual ones.
The other thing being that the CC's native resolution is simply out of date. As screen sizes and resolution settings get bigger, the CC's visibility gets smaller and smaller.
For me it's all technical issues. From what I have seen from the CC crowd, it's all emotional/personal issues. From my standpoint, I'm more personally/emotionally attached to the game itself, not to any specific client. If they were to introduce a new client next week that was an improvement on what the EC has done, I'd jump as soon as I could. I've done it 3 times already (to 3d, to KR, to EC). Going to 3d became necessary when I first got a 17in LCD monitor. It had PLENTY of issues, but I worked around them when necessary. Going to KR was a slight inconvenience for a few days because they shut down the 3d client BEFORE I had access to the KR client. Going from KR to EC has probably been the most difficult because of the downgrades in quality (art and in some areas the UI), but I support it in hopes of seeing further improvement.
The game though has always been the same. Maybe the way I use certain macros has changed, but the game itself has always been UO and until they ditch the sandbox, skill based nature of the game, it always will be, regardless of client.