[Idea]GTFS to OSM

Nowadays there are many transit operators distribute information about their network using GTFS format, including bus stop, service details and such.
It would be nice if there can be some sort of tools to help converting those GTFS-based info to OSM.

What is your result when you read whole entire wiki page about https://wiki.openstreetmap.org/wiki/General_Transit_Feed_Specification ?

I see there is a tool named GO-sync that can achieve what I want according to description, however the description in one of its sub-page say “GO_Sync should not be used in areas where the local OSM mapping community has already mapped a substantial number of the agency’s bus stops.” which would mean that doesn’t match the need.