When you start using any framework that's supposed to do the things you don't have the time to learn yourself, you take on technical debt. For example instead o

When you start using any framework that's supposed to do the things you don't have the time to learn yourself, you take on technical debt. For example instead of learning how to create mobile web applications you start using JQMobil, Sencha or PhoneJS. Now you end up spending time to learn both the CSS, HTML stuff in addition to the framework to get the end quality you want.