The rich APIs (either for flex, silverlight or javascript) should be able to consume, at least, non transactional OGC layers without development... I mean WFS, WMS, tiled WMS
If we can deploy a WFS on the server side, it should be also possible to consume it on client side. So I would appreciat to have access to WFS in the Javascript API
support for wfs in javascript api is a basic requiremente today.
Agree with MAGISNC: "Because missing the support of WFS, we can not effectively promote the use of ESRI APIs to build webapps for organizations asking for Mashups with OGC compliant mapservices.
This point is very important for users in Europe where Inspire directive defines OGC as the standards for web mapping."