Why is D unpopular?

[Walter Bright]

On 5/17/2022 8:41 AM, Paulo Pinto wrote:
> It certainly does have to a lot to catch up with SPARK, and NVidia has chosen 
> Ada instead of Rust exactly because of that, yet there is money being thrown out 
> at the problem, and standard organizations interested into making it happen.
> 
> It won't be there today, but it will eventually, because they have one specific 
> answer to "what you use X for".

I'm curious what feature(s) of Ada led to NVDA's selection.