Meaningful identifiers and other multi-token keywords

[Imperatorn]

On Tuesday, 24 September 2024 at 20:37:36 UTC, Quirin Schroll 
wrote:
> D’s has 4 places in the grammar where meaningful identifiers 
> are used instead of keywords:
> - Pragmas
> - Traits
> - Linkages
> - Scope guards
>
> [...]

Just a question, what would that mean for backwards compatibility 
and potential loss of flexibility?