I would like to suggest a global partials feature, so you can access partials from another plugin or from the theme. The basic usage would be an option to have an ui component library / plugin.
I develop a website which has a lot of custom stuff and so I split all the work to multiple plugins.
However, since the design elements often include similar things, I have to rebuild the ui components quite often.
I asked this earlier if there’s a possibility to do this and got a no, so I would definitly suggest to add a feature here, it would make work a lot easier