As a longtime Mac user, that’s not quite as easy. Some apps are only available through the Mac App Store. For applications you download there are several variants:

• installers: double click and go through an install wizard with next buttons
• zip files: double click to unpack, then put the app wherever you want (typically /Applications or ~/Applications)
• disk images: double click to mount. Then drag and drop the app to /Applications
• through macports or homebrew via command line
• there are a couple of Apple system tools, that are often installed via command line like Rosetta and Xcode command line tools

Of course you can have a zip file, that contains a disk image, that then contains an installer.

For applications downloaded from the internet, you also get at least a warning when opening it. If it’s not notarized, you have to go to system settings to be able to run it. For many applications, you also need to go to settings and fiddle with sandbox settings to make them work.

New users are often challenged by all these options. There are many who end up running an app from a disk image for example.

You might also need to select the correct architecture because some applications don’t provide universal binaries for some reason.

While installation is an issue for Linux, the bigger issue is the low availability of quality commercial software. The immense fracturing between distributions creates tons of issues as well.

appimages also allow some sort of portable apps you can carry around. Very useful for dealing with no internet scenarios. I also use appimages for things iI use very rarely and don't want to bother to have them being updated regularly along with the system