Earlier quoted context omitted.
The choices are tough, also in details: Which shops to show in busy areas at which zoom level? But mind: openstreetmap.org is ment as a developer site, for developers to see their changes quickly. The official idea is that other people should take the data and do "nice" things elsewhere. But of course reality is that users want to use openstreetmap.org as alternative to Google maps ...
Official? I've never heard this as official doctrine. Can you point me to anything official? I'd love to see OpenStreetMap.org be more directly useful to more people, rather than only as a "developer site".
The main purpose of the maps on the site is, besides showcasing some topical uses of OSM data, rapid feedback to contributors, which is something that required specific development so that can be provided with vector tiles too.
The 'late to the game' narrative seems to be a bit misplaced in any case given that OSM data has powered essentially all vector tile use outside of Google over more than a decade.