I agree with you on premature optimization. However, once you've learned how the internals work, using that framework doesn't save you much time in the future.

I agree with you on premature optimization. However, once you've learned how the internals work, using that framework doesn't save you much time in the future. For instance, once you know how databases work, an ORM won't save you that much time -- it'll just shield from the internals, which are what I find interesting.