In the Marines, a “boot” is a new Marine and is what you are referred as for the first two years of your service, regardless of your rank. When I served in the Marines, one of the things that bothered me as a boot was that leadership positions were assigned based upon experience. The idea was that because the senior Marines had been in longer than the new guys they were more qualified to lead, but unfortunately this wasn’t always the case. Blue Bridge has been in business nearly three times longer than I was a boot (six years). In reflecting upon my own experiences as a developer and seeing much amateur work over the years I've come to appreciate how important of a factor experience is and how the Marines might have ended up with that simplistic system. Experience has a tremendous impact on how a project is accomplished and much of the time, that impact is felt directly by the client in their bottom line.
My rationale as a junior Marine, and one that I still agree with now, was that experience isn't an end unto itself, but that it must be reflected in performance. How experience impacts performance is by improving judgment, and judgment for complex projects, like software development, is critical.
Judgment will enable a Joomla! developer to see the consequences of their development choices. It will allow them to anticipate obstacles from having encountered trouble in their previous experience and it will also increase their accuracy. A generalist with lots of PHP experience will still have a hard time gauging the true project cost of working within a specific domain like Joomla. They may have plenty of experience, but the lack of focused experience will hurt them and their clients.
So how does a lack of experience strain profits?
Why does anyone work with inexperienced developers then? They’re cheaper, of course- or at least seem cheaper at the onset of a project. So when looking at development vendors, keep in mind that even though veterans generally cost more, their focused experience will pay dividends for your peace of mind and bottom line.