That works for things that are installed via the app store, but I install things from other sources as well.
I don’t know what you mean by platforms, but if the software I want is not in the app store, I usually go to their website and see how the developers recommend installing it.
Sometimes I download an appimage. Sometimes I download a .deb. Sometimes the developer wants me to wget directly into sudo (yuck) sometimes I have to clone a github repo, rarely these days do I have to download a source tarball and make compile, but maybe I get some old software that works that way.
Sometimes it is confusing because the software I installed (e.g. Steam) has the preferred way from the website different from the version in the app store (Steam-launcher or whatever). The problem is I don’t remember which method I used to install what.
In my imagination, I open the universal uninstaller, and start typing the app. As I type it shows suggestions. If I select it, it tells me how I installed it (downloaded a deb from their website, etc.,) then the next click takes me to the correct uninstall method.