That's perfectly fine. If you can't see it, you can't see it. You need to know what to look for to see it, though. If you're oblivious to web development then every page is just a page.
> You receive like an email a minute?
Irrelevant. The range of operations that Gmail supports and falls within the lazy classification of CRUD operations goed way beyond sending and receiving emails. For example, see gmail's support for tagging, email classification, multiple types of inboxes, etc.
> It's literally basic web 2.0 junk from the early 2000s (...)
Tell me you're completely clueless about web development and WebApps in general without actually saying it. Just keep in mind that you also have the option of not commenting on things you're oblivious about.