> I appreciate the examples. I think there are good reasons not to
> implement these kind of extensions, at least in this form. I'll reply
> to each example below.
The problem is your argument comes from a position of... because you
don't like those examples, we shouldn't make accomodation for them or
anything like them in future.
Adopting such extensions is a matter for a future RFC, and not for
preemptively throwing a spanner in the works.