Part of the issue is geographic. These rims will be sold globally but the acceptance for tubeless is not the same in all of the markets involved.
If the rim can accept schrader, then people in some markets can run standard schrader tubes. Tubeless users can use the grommet and things should be fine. This was the original thinking.
In the end, I'm pretty sure we'll convince them to go presta but it was an interesting conversation since it wasn't the foregone conclusion we thought it was.