Permalinks with %postname% as the only Element

I found the comment below in the docs. I have the latest WordPress version. Is it really bad to use just the
%postname% element, as in “www.mysite.com/my-post-title”? I much prefer that style and set mine up that way, but I don’t want to cause problems in the future. ??

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Note on using only %postname%
If you use postname as the only element in your permalinks to create a structure such as myblog.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. 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.