why this page not available for all JoomShaper templates.
Hi. Because it is an outdated approach. Which created a lot of excess code, which was mainly not involved, but it occupied the browser resources.
Now not require any CSS classes. In all templates SP Page Builder on board, where you can configure everything as you need through the interface. For all other things, no additional styles are created. Only one style running from the template. And if you need some kind of your own appearance, then you must write your CSS code.
About such things as pitech-service-carousel and others. This is just one style for addon, which comes with template. There are no other classes to change this appearance.
If you need, take this class and write for it your own CSS