Would it not make more sense to just package up the whole repo as budgie-extras ?

I would prefer to be able to install applets individually, never really liked bundles. There may be technical reasons, that is, when a software is very often used in conjunction with another one, as could be argued is the case with android-tools in T4954. But then this is really a problem with the author of the repository in the first place. Maybe it should be discussed there?

In my opinion, it would be the best to package each applet individually and then just add budgie-extras package with all these applets listed as dependencies, like it is done with libreoffice-all package.
But in any case having them all bundled is better than not having them at all.

Yeah or similar to what @joebonrichie has suggested for T4954. The reason behind this - for me at least - is quite simple: give the user maximum control over the programme. If you want to install a specific programme but it comes bundled with tons of others you don't want (of course dependencies are a different issue and they are necessary ingredients in the actual "dish"), the installation essentially circumvents a user's consent.