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...they’re one of the most exciting new ideas on the web. But to truly have an impact, it's important that they’re indexable and linkable. Every recommendation presented in this article is an existing best practice for indexability...
The reason that Google is so solidly behind PWAs is that typically web apps are search black boxes and that is a threat to their very foundation.
So if you run a website and you are not a huge player, the closed web is as bad for you as it is for Google and in the same way that PWAs give Google a tool to fight the app black box, be it Amazon or Expedia, it gives that same chance to webmasters. Face it, our small businesses are almost never going to motivate users to download our app for the one-off purchase, but a PWA gives us a ghost of a chance against Expedia or Amazon and their apps. That is, if the web experience is as good as an app, there is much less incentive for users to lock themselves into an app.
Note: on a related note I have absolutely no idea why sites, with the visitor locked in clicking to download their app, are almost always referred offsite to Apple or Google app stores. Idiocy to the n-th.
I really do not see how giving Google (or any SE or other third party for that matter) access to apps, including PWAs, offers small players a chance to fight back against huge players
Because it will encourage people to use Google instead of going straight to the app, and if they start from Google it levels the playing field a bit.