There are so many widgets und libraries (charts, paint etc...) all of them require jquery-Framework. Because of this unprofessional peace of code, named dojo it is inpossible to include jquery. (Name conflicts? Not tested sw?...)
I need 10 min to create new roo application, but days to get Charts Library or other work... senseless
Please do not reinvent the wheel. Let us users decide which JS-framework to use.