A: Depends on your business needs
Content Management Systems are a robust way to keep track of your/your teams website assets (files, pictures, videos, scripts, etc.), enable a coding interface for advanced users while having the option to use a WYSIWYG (visual editor) interface for those users that may be involved updating the website with limited coding knowledge, and provide a mechanism for webpage templates to encourage theme and code consistency across your website. These are some benefits for using a CMS, and like everything else some are better than others depending on your needs and situation.
A large corporation, for example, that has many staff and faculty from different departments would most likely use a CMS. The IT staff would set up the CMS, and enable certain edible regions for other employees to maintain their own department's subpages within the website.
A CMS can be a great solution for those tending their website solo. The same benefits can be applied to a team. When I design a website for a client and they want certain features that are beyond my knowledge I may suggest a CMS that has the built in functionality the client wants.
Ask yourself what functionality and features you want for your website and think of factors like time and money before jumping on the CMS bandwagon. They are a good solution for some while not making as much sense for other websites. Some CMS's are free but they can end up costing more to alter the underlying code down the road. If access to making text updates is all the client wants to control maybe hiring a web developer to create a custom back-end login for such a simple task makes sense.
There are options and it's better if you are aware of the pros and cons of each viable solution: Startup cost versus longterm cost? What features do you want for you website?
"Ricky was always ready to listen to any ideas for the website and offer his suggestions, which were usually right on target. I do not think you will find a nicer web designer then Richard Razo."- Ken Kollwitz (CIDA)