What is so evil about a Flash based website?

Question

I have the feeling that Flash-based ( or Silverlight-based) websites are generally frowned upon, except when you are creating games or multimedia-content rich applications.

Answer 1

1. content weight
2. usability
3. crawlability of search engine bots
4. accessibility
5. ease of use (disputable)
6. technology encumbrance (added software required to access the site)
7. security issues (needing to add software comes with issues involved with installing or running that software/player of the content)

[Edit] Why I place usability and ease of use separate is best explained in this link

Usability:

• a result – software that is usable;
• a process, also called user-centered design, for creating usable software;
• a set of techniques, such as contextual observation and usability testing, used to achieve that result; or
• a philosophy of designing to meet user needs?

Ease of use:

• Effective
• Efficient
• Engaging
• Error Tolerant
• Easy to Learn

I agree with the comments on that site, but this is all debatable...could be a good stackoverflow question: is usability and ease of use the same? IMO part of usability is ease of use and vice versa, but they are not necessarily the same.

I hope I don't enfuriate the more semantical sensitive with this edit :-)