Could this support smart decimation a la CATS/Polytool?
We have been looking at decimation, but may not include it initially. It’s a complex topic, but it is on our minds. See @Feilen’s response below :)
Is this non-destructive in case something goes wrong?
Yes, non-destructive including a preview mode!
Do toggles still work after mesh merging?
Could UV tile discard also be implemented?
Yes, and yes. We use animation rewriting to turn object toggles into UV tile discards :)
As for working with third-party tool authors: This is something we will of course consider and do as we get closer to the finish line, for now there’s too many open questions about our end of the design to reach out (as far as I am personally aware).