But more importantly, the challenge for any such tool is to go beyond use by 2-3 people. At 2-3 people anything will work. Where BI tools (open source and close source) struggle is scale: having all the right features for, essentially, a group of users who actually don't know how to work with data (did I just say that aloud?). Chartio caps at 20 people. RJ capped at 50-100 (and later became Stitch for that reason). We haven't seen where Metabase caps, but I bet it is in a similar range. Very few BI products have actually surpassed 100 users at target installations. And beyond 1,000 is a real challenge that only few, and even then with a lot of assistance, can support: Tableau, Looker, Microstrategy, maybe Birst, maybe Domo.
Also, a combination of BI with LookML is a complicated product. During my days at Looker, we were handling 50+ bugs / week, and filing 1,000+ tickets. Every day we were filing over a 100 new features.
So with all that, the question is, is it really worth the struggle? What's the end vision for supporting this? Why should someone who implements BI for a living bet on this product?