In general, they follow the old client-server model because of the need to have a custom protocol for updating the graphical elements. This generally entails some sort of half-model-plus-protocol that replicates most of the model information on the client. This allows the server to send very little information to the client for a large effect on the client. Having written one of these in AJAX, this takes either Neither of these is simple to maintain. This is why those MMORPGs suck, have few features, or have a monthly cost.
My criteria for good software:
  1. Does it work?
  2. Can someone else come in, make a change, and be reasonably certain no bugs were introduced?

In reply to Re^3: What's a good alternative to browser-webapp-webserver for remote apps? by dragonchild
in thread What's a good alternative to browser-webapp-webserver for remote apps? by rudder

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