I think experience can actually become a liability. Things have changed and you don't have to write assembly code to optimize your program. Compilers will probably do a better job than you. And if you have a lot of experience writing JavaScript for IE6, you may actually be wasting time optimizing in ways no longer relevant.
True, but this is why you tend to migrate towards an architect/lead role later in your career where the general insights about systems and design are still applicable with out needing to overly focus on present day implementation minutia .
