> Although it is easy to add to a list using push, it currently looks
> hideous to be able to
> add to the end of a list.  Would be appreciated if emacs could have a
> function as simple to add to the end of a list?

`add-to-list' with optional arg APPEND?
____

I wonder how you try to find such info.
Did you even look in the Elisp manual?

`add-to-list' is in the same node as `push',
node `List Variables'.

https://www.gnu.org/software/emacs/manual/html_node/elisp/List-Variables.html