One issue is that some Mathematica applications are free, while others are proprietary. Thus a single "Wolfram Application Repository" could not cover all the applications one might one to use.

Another issue is that some applications, particularly some older ones, were not designed for such straightforward "plug-and'play": some were designed as single .m files that are supposed to be dumped directly into the root $UserBaseDirectory/Applications folder; for others, the context name might not match the name of the folder you get when you unzip the download.

There's a fairly standard way of handling such applications. Say the (main) package begins BeginPackage["MyApp`"].

• Name the .m package file MyApp.m
• Name MyApp the folder into which everything for the application gets placed
• Create a subfolder MyApp/Kernel
• In that subfolder place a file init.m containing just: Get["MyApp`MyApp`"]

That procedure allows loading the application with a simple <<MyApp`

Of course some applications that involve many packages must use a somewhat more complicated scheme, but that shows the basic idea.

I know I can create a package to do that, but the suggestion is to simplify this operation in a native way. R is very famous for it simple way to install a new package, I use it, and I miss something equivalent in WL.

I believe that you can already do this within Wolfram Language. All you need to do is to build (or find) a package (a .m or .wl file) and save it to the appropriate directory. On the desktop, there is the $UserBaseDirectory that will work, although saving into the Applications folder/directory inside this directory is probably better. For the Cloud, there must be an analogous place to store packages.

You could probably write your own function, installPackage[], that will do exactly what you want to do.