An awful lot of me agrees. But multi-sourcing of data has huge advantages when it comes to verification.So much duplication of effort going on. Hopefully one day, all the major map providers will have a data sharing agreement.
In the past, the specific highly detailed street map which included my house had the house numbers wrong. These maps were surveyed by the Ordnance Survey who served as the source for the majority of UK maps. Thus, pretty much every map which was sufficiently detailed would carry the same mistake.
I'd like to think that a combination of data sources - OpenStreetMap being one example for today - would far more likely raise a clash warning and see someone check. (Were I in the same position today, I'd flag the issue, but in those days, writing a physical letter seemed over the top for a small error.)
So, yes to data sharing but not if it results single sourcing.
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