That was my take on this. That Smartphone was cheap and mediocre enough for them to simuldub as quickly as possible. At first, they miss out on what they can and can't dub because there's only so many shows they can cover in their budget when they're juggling Hero Academia, AoT, and the one or two high profile anime.
The ones that slip in the cracks and grow stronger, however, probably become harder to dub as the standards it takes to dub them go beyond just having your standby VAs give whatever performance they can push out. It kills the momentum that Re Zero and Konosuba could've had, but the model places a higher priority on the one or two big budget shows popular here while the cheaper turds can have a quick dub shat out, and whatever doesn't get picked up will be stuck in limbo.
It's not too sustainable if they pick up worse anime and their tent poles get worse, but it's slightly better than Netflix's model of waiting until a show's over and the excitement has died down to release it all in one go.