Czuch: 1) coan.net is right.
2) There are even more background tasks going on.
3) Too many new features means too many new bugs. It's easier to maintain a site with less features. Furthermore, a typical user wants just to play tons of backgammon games as quickly as possible.
4) There were many features added in the recent past but since they don't affect the English speaking community, it is very likely that you didn't notice them.
5) It is not possible to address all feature requests. Ergo, only the most important ones are implemented. Sometimes.