In my opinion, it is not possible to create a set of widgets that work for everyone's usecase, without being way to bloated and complicated to use.
However, I also recognize that some users just want some basic UI elements they can set up, and be done with it.

I am debating if Inky should provide some default implementation for elements, such as buttons, labels, sliders, checkboxes, radioboxes, text fields, et cetera. And if so, how would these widgets be styled by the user?

Alternatively, these widgets could be hosted in one or more other repositories, there could be a Material-like implementation, a ImGUI-like implementation, et cetera.