E.g. effort for implementation, increased complexity leading to reduced useability.
But it is quite easy to create your own overlay for a region via overpass turbo.
Example for sustenance:
- select desired area on map
- press “Run”
- browse found items in overpass turbo or
- export as GPX and import GPX as overlay in Kurviger (app or web)
For sustenance amenity tags see
https://wiki.openstreetmap.org/wiki/Key:amenity#Sustenance