Permalinks – Using only Postname

Hi all, the codex states for “using only a postname” as a permalink the following:

Using only %postname%
If you use postname as the only element in your permalinks to create a structure such as example.com/post-title, the rewrite rules may make it impossible to access pages such as your stylesheet (which has a similar format) or the /wp-admin/ folder [is this true in WordPress 2.0+ versions?]. It’s best to include some numeric data (e.g. the post ID or date) in the permalink to prevent this from happening. Additionally, WordPress v1.2.x requires the use of a date structure in order for some features, such as the calendar, to function properly. /%year%/%monthnum%/%day%/%postname%/ is always a good start.

Before I start this, although I might start testing in a sandbox. Can someone tell me if they know the answer to the question embedded within this body of text by the original author? i.e. is this information still accurate for current versions?

I use wordpress across many sites in many different variants. Some of which see me use wordpress solely as a CMS with no “blogging” use.. just static pages. And, for those few sites, I’d love to pretty up the URLs.
Some sites have a combination of static pages and posts. Those two I may be interested in prettying up.

Look forward to any feedback.

Cheese!