[1] Google no longer unilaterally pulls on web standards. Google and Apple adopt a shared, first-class standard for native app development. Web gets "as native" APIs.
[2] No requirement of app store for distribution. Web installs and web as native. No scare walls or hidden-in-the-settings feature flags. The browser runtimes have full extension support with no removal of hooks necessary for eg. adblocking.
[3] First party apps are not defaults, not preinstalled, and more importantly, cannot re-assert themselves as defaults.
[4] If someone searches for your company or product by name, or a 1 edit distance variation, competitor ads can't show up before your website or app.