Simple styles are commented out because they (the htaccess rules for them) can conflict with other styles. Once you have them un-commented, the other styles might not work until you comment simple styles back again. You might also have to comment out the other styles as well when you have simple styles un-commented.

It is also very easy to mess up and accidentally lock yourself out of your site.

I'll take a look. I didn't test / work with simple styles yet in v11 because my server doesn't like them. This may end up being an issue I leave open for someone else to resolve if my server ends up not playing nice.

Personally, I do not recommend using the simple styles. I'd recommend using the ".htm" style URLs. The HTM plays much better with servers and helps Composr identify what is the page.

I haven't had any issues in v10 to be fair, and sadly I have well over 1000 links on Facebook that don't have .htm so I'm kind of commited to the cause given these links are already shared and in use. Ideally when upgrading to v11, if that becomes a possibility (still cannot integrate my version of Plyr which is quite simple) I would like for these links to remain valid.