SEO is still an unsolved problem, imho. Has anyone experience with this? We run a ecom business with millions of products, fast responses in time are necessary

SEO is still an unsolved problem, imho. Has anyone experience with this? We run a ecom business with millions of products, fast responses in time are necessary for us. I certainly like the idea of PWAs much more then fragmented native mobile ecosystems. But it seems quite complicated compared to a classic web app. As others noted, service workers are tricky to set up. Maintaining the offline cache is quite hard. I am quite sure that average ecom apps will easily hit the proposed 10 MB cache quota if the useful views for offline viewing are preloaded. Strictly using an LRU seems silly because the user will likely do different things if he realizes he cannot load new content. (I.e. he could decide to prepare an order with his data.) There are lots of tough decisions to be made even before thinking about cache invalidation. Routing and history changes are quite puzzling for me. Quick tests on history api made me realize that it is 10 times harder then it looks, not even sure if it works.