3. The "+cbor-seq" Structured Syntax Suffix
The use case for the "+cbor-seq" structured syntax suffix is analogous to that for "+cbor": it SHOULD be used by a media type when the result of parsing the bytes of the media type object as a CBOR Sequence is meaningful and is at least sometimes not just a single CBOR data item. (Without the qualification at the end, this sentence is trivially true for any +cbor media type, which of course should continue to use the "+cbor" structured syntax suffix.)
Applications encountering a "+cbor-seq" media type can then either simply use generic processing if all they need is a generic view of the CBOR Sequence or use generic CBOR Sequence tools for initial parsing and then implement their own specific processing on top of that generic parsing tool.