To the best of my understanding, it is in general true that for (future) Script-based covenants based on programmatic restriction on the outputs (as opposed to restrictions obtained via presigned transactions), stability of txids doesn’t seem to be useful. Therefore a simplified version of CTV that only commits to the outputs would allow greater flexibility, at no cost. Vaults constructed with CCV+CTV (essentially the same as VAULT+CTV) are an example.
In constructions with such expressive covenants, CSFS might also be used as a means of enabling certain spending paths without depending on stable txids, by signing a message instead.
However, connector outputs seem to be somewhat of an exception in that I am not aware of an equally easy covenant-y replacement for this primitive. Generalizations not based on presigned transactions do exist (see ancestry proofs/singletons) and it would be interesting to further explore what opcodes would enable the cleanest implementation.