Hello eufive!

Thank you for your detailed response.

We are not mapping specifically for renderers or routers, so that shouldn’t be the main focus here.

I agree that publicly accessible areas are indeed tourism attractions, and it makes sense to tag them accordingly.

Regarding residential versus pedestrian classification: I guess most of the area isn't currently occupied by residents and is mainly accessible on foot or by bicycle, but not by motor vehicles. In that case, marking those areas as highway=pedestrian seems appropriate.

However, I would suggest keeping highway=residential for areas where motor vehicle access is allowed, even if only by permit.