Today, we all know that the individual feature of the internet is speed. Getting outputs as soon as possible is critical and we want information to be available on demand.
In website development, this feature and philosophy of the internet is well embraced. Just as expected, people who pay professionals to build their own websites expect to see results in a few days, generally a week at most. And with profits for web developers hinged entirely on the number of projects done, speed definitely is the bread and butter of these companies.
The development of Content Management System (CMS) like joomla or mambo allowed developers to make websites at the shortest time possible even if these websites need a little sophistication (this means that it may need to have databases, which is by the way normal to have today).
Aside from the speed of development with the help of CMS, websites developed with it are less likely to have bugs since they are basically created from similar software that web developers constantly refine to rid it of errors and other compatibility issues.
What also makes web development through CMS great is because of its customization features. Its open source nature allows a capable web developer to build layouts of varying designs and sophistications. In short, it could look like anything you want it to be depending on your tastes.
At the end of the day, you could definitely expect a website that is aesthetically sound and is virtually compatible to any web browser that we know of. Add the fact that you have the website in less than half the time that it generally requires when it has to be built from scratch.