We were looking at options on BAQ but BAQ service is not the resource - the baq itself it the resource. That means the tables are specific to the individual BAQ as a service. If you read that as a cop out, I’ll take that abuse. 
We need to support a baq hierarchy as a service to deliver what I think a lot of folks desire. We did this for Electronic Compliance for example - SSRS PSA on Filtering Subreports Performance Fixing - #12 by JeffLeBert
If we treated BAQ itself as an end point, the meta on that would take out a few datacenters trying to generate the meta. The generators out there like Swagger are just not built for large data that would be visible under all the BAQs visible to a user. We’ve scanned more than a few generators and scoped what it would take to create an incremental loading mechanism for all the meta (open Customer and you’ll see the need as well).
It’s an open question and the PO over REST @bconner has looked at this a few times. There are some other activities underway they are ahead of this on the delivery train atm but it is an interesting problem we wish to tackle.