One question I have - should we keep building apps in the document model (http / https), or finally create a true static document model and add a separate app l

One question I have - should we keep building apps in the document model (http / https), or finally create a true static document model and add a separate app layer? I can't believe after 2 decades that browsers are still missing so many native elements - date pickers, menus, flyouts - how many of those have been written for the web?