D3 together with Phobos v2

[Nick Treleaven]

On Tuesday, 29 March 2022 at 10:55:14 UTC, IGotD- wrote:
> The work on Phobos v2 has been initiated which is a good thing. 
> However, shouldn't D3 be developed alongside withe Phobos v2?

Is there any consensus (among the lead devs) about what needs to 
change about D2? If not then why do we need D3? D2 can continue 
to add backwards-compatible features and even deprecate any 
mis-features if the maintenance cost is too high/too restrictive.