@Alexander_Torrado Thanks for all the careful verification! 
guidance_hint_form.xml.txt is the XML of a form you can use for verification.
There isn't yet a way to add guidance hints to XLSForms but there is a pull request open at https://github.com/XLSForm/pyxform/pull/206 if you or anyone else would like to review it. This will add a new guidance_hint column:
| type | name | label | hint | guidance_hint | relevant |
|---|---|---|---|---|---|
| int | a | label | normal hint | This question is skipped if the answer to ... is less than or equal to 5. | ${num} > 5 |
Currently the All Widgets form only contains the different question types and doesn't include anything about calculations, logic or any other kind of extensions. If there's interest in adding more of that kind of content perhaps we could either add a new section or create a form specifically for logic and other extensions. You can find the current All Widgets form linked from the Collect README. Feel free to add comments if you see places to make additions or other changes. I have removed the two odd question types you and @Grzesiek2010 discussed above. For guidance hints specifically we would probably want to wait for that XLSForm support I mentioned above.