Absolutely this. I've been thinking since the thread started that the two operators with which I'm most familiar, GWR and Avanti (and their predecessors) are simply both, not “primarily” one or the other. It's just one of these ill-posed questions which crop up quite frequently.
Agreed - I don't know why people are so fascinated with trying to turn everything into some binary argument
Is it ill-posed, though? Almost every other country segregates, because the needs of the two user groups are highly disparate.
British exceptionalism?
Almost every other country built their railways
after us, and in a more organised manner (than our "leave it up to Victorian entrepreneurs and then the state comes along and tries to bail them out whilst picking up the pieces)
I think we'd be better turning this into a thread about If I Were Building The First UK Railways In 2021, This Is What I'd Do, rather than trying to reverse engineer some Germanic solution to our problems. Maybe it'd all be lovely if our trains worked like theirs did, but we aren't starting from scratch, we don't have the ability to rip everything up and start again
For example, maybe you'd turn Edinburgh - Plymouth into a faster service only stopping at the larger places and only every few hours - maybe that makes sense if you have a blank sheet of paper - but on the busy clock face network that we have, there's no space for such luxuries (it'd only get stuck behind some 75mph/90mph train, so wouldn't save much more than a couple of minutes overalll, but at the same time you'd be inconveniencing a lot of existing passengers). There's simply no space to fit in both types of service, which is why we have these messy "compromises" all over the network (however much it might annoy those with a binary fixation)
If we're talking about what we have, I think it definitely is … the thread title asks about current users of UK “InterCity” TOCs (without actually defining what those are, as well … any TOC that provides a service which calls at at least 2 cities, I guess would be the most logical interpretation?) — and I think the answer is that both “classes” of user use them in general, not primarily one or the other
I suppose that, by that definition, the Tyne & Wear Metro is InterCIty (the Green Route links the city of Newcastle to the city of Sunderland), Metrolink is InterCity (the Blue Route links the city of Manchester to the city of Salford) and the Supertram is positively inter-
regional (the Blue Route runs from Yorkshire & The Humber through the East Midlands and back to Yorkshire & The Humber)... as well as many London Underground services (which run from the City of Westminster to the City of London)!
But then, there's never any agreement on what InterCity is, other than people who have a fascination with 1980s BR and try to re-engineer things to fit that (which means we have to pretend that Gatwick is somehow a "city")