To make things short, in the docs, there's a concept of PLAIN buttons however this is not represented in the UI Kit.

We do however see colors regarding the plain type in the colors page of the UI Kit

Did we get an outdated UI Kit? Or does our copy from March 30, 2023 just doesn't have it?
P.S. On another note, if there are updates for the Figma UI Kit in the future, will we still get them? Or are we stuck with the version upon purchase?