From my point of view, item 2 “to find, copy, and execute examples” is the most critical one.
PkgTemplates could be a bit easier to use and get simple default settings, but at least the mechanism is there.
We have add to include packages and dev to work on packages, but there is no good way to get a package and play with the examples.
I am using a slightly cumbersome workflow similar to what I described here: How to use VSCode and REPL to write and test a package? - #33 by mefob
Something like this should absolutely become part of Pkg to establish a standard way to setup packages with examples.