That argument goes both ways; "the rest of my system" is web apps.

When I browse on a phone, I often get bombarded with "install our app!!" prompts. No. Stay in your tab where you belong, where you're sandboxed, can't show me ads, and are generally speaking subject to my user-agent which will not let you do all the things that make you want your tentacles less constrained on my system.

I want native apps even less on a laptop than I do on a phone, because at least mobile apps are somewhat sandboxed.