This really is the crux of the issue. It comes down to “your ERP has some information I want in my ERP” - followed by twenty emails, redirects to find the person who actually understands the schema of the ERP on each end, mapping the fields, and finally sending the info.
What’s missing is not some omniscient decentralized master system, but a standard framework to rapidly conduct data negotiations between private parties and systems. Each party needs a public-facing searchable data catalog of some kind so requests can be made precisely the first time, and so each party understands what they’re agreeing to.