What are (were) the most difficult parts of D?

[eugene]

On Tuesday, 17 May 2022 at 11:50:30 UTC, zjh wrote:
> On Tuesday, 17 May 2022 at 06:28:10 UTC, cc wrote:
>
>> Far better to just keep your house clean every day than let 
>> the trash pile up and wait for the maid to come, IMO.
>
> Right,GC is a bad idea!

As I've already mentioned I think the origin of GC is functional 
langs,
and the reason to have GC as essential part of a language is 
*immutability*,
immutability as a main principle.

Say, we have an array of 10 floats and we want to change 3rd 
element.
In truly functional language we can not do that - we must
produce new array in which 3rd element is changed.
Old array is now garbage, i.e. we *naturally* have A LOT of 
garbage in
functional langs.

But D as 'C/C++ with GC' still puzzles me.
Of course I know about BetterC, just have not had much time
to try this option.