Scrollbars are a tool and they should be functional: visible, properly sized and interactive. It helps if a scrollbar looks and functions the same on all our content, because it takes less mental strain to use.
It may be that you don't like scrollbars for your content. The obvious solution is to make your content fit so it does not require scrollbars. If you cannot manage that you will have to live with the fact that scrollbars are there as a functional tool and make sure it is kept functional.
In analogy: If I sell furniture you have to self assemble I can choose to design it to not require tools. If it does require tools I should make sure people can actually use those tools to assemble and not try to hide that tools should be used by pretending the thing to put nails in is not a hammer.