Don't exactly know what you mean with hiding buttons in the styleGuide. Reffering to the screen filters I guess you mean that you're talkin about the reset button where the search options are being reset to default.

I think this is a option that you must keep because a lot of 'new' users are using the styleGuide also to see what is possible. On this way they can see how this is done.

I'm talking about the default pattern where the clean button in a default style guide form is hidden and will only be shown if there are filters set.

I agree.
well, it's not a horrible pattern, but slightly a confusing and inconsistent pattern ;)

The button could be disabled instead of hidden.

Thanks for the feedback, We are in sync and we will correct this pattern in 5.1, by always showing the "Reset" button.

This is one of the many small productivity and usability improvements in 5.1! Read more about 5.1 in this forum thread.

And, of course, thanks for you feedback!