For many things these methods of delivery are terrific. There are ethical and legal reasons why we should consider disabled users. Auxiliary aids include taped texts, Brailled materials, large print materials, captioning, and other methods of making audio and visual media available to people with disabilities. ADA Titles II and III require state and local governments and the business sector to provide effective communication whenever they communicate through the Internet. The effective communication rule applies to covered entities using the Internet for communications regarding their programs, goods, or services since they must be prepared to offer those communications via an accessible medium.
Accessibility is a big deal, and it's getting bigger.
Thankfully, the answer is no. Consider your content. If you are doing something just for fun, or to express yourself artistically, go crazy if you want. However, if you are designing a site that explains how to handle hazardous wastes in the household, or contains a list of emergency contacts, a plain HTML solution would be better. Also consider your audience.