If Google has the web and mobile covered, why would they invest so heavily on a hybrid? If Tinder and Facebook are already benchmarks of success, why would they invest in PWA versions? Why would those of us working on less grandiose projects want to build PWAs? This talk will answer those questions, and give a guided tour of the state of PWAs today in various platforms; architectural issues, cache and design strategies you may need to consider in order to build commercial PWAs; and the tool ecosystem available to you. It will also touch on why you wouldn't build PWAs.