Sometimes I have very stupid ideas. People usually laugh at first, but I've learned that there's truth in every stupid idea. So, my latest dumb idea was to turn CSS into CSS! Sounds great, I know. If you're working with Bootstrap 5 and want to use CSS variables to change the color of some buttons, for example, you'll find that Bootstrap can only handle this in some parts of its components. They are working on fully supporting this with Bootstrap 6, but they also rely on SCSS in their components, and if they were to change it now, those would be breaking changes. The sad thing is that there is currently no date for when Bootstrap 6 will be released.
