What are the prominent downsides of the D programming language?

[Per Nordlöw]

On Tuesday, 29 September 2020 at 16:57:52 UTC, H. S. Teoh wrote:
>> Look at Phobos source code: complex template constraints.
> [.> IMO, overly-complex and opaque sig constraints is a sign 
> that the template was not properly designed. A lot of the 
> complex constraints in Phobos leak

Agreed. This will benefit compile times aswell.