Saying "you have a reserved place on this service, but individual sear reservations are not possible" answers neither question clearly & unambiguously.
It's also false - 'counted place' is industry jargon, so rightly not used, but the use of the term 'reserved place' in substitution is just misleading. There is no place on that train reserved for that particular passenger. For all the retailer knows, the train may be full on arrival and impossible to board.
The recent history of the introduction of advance tickets to the GB railway (a textbook case of 'bait and switch') also needs to be borne in mind. The phenomenon of operators of local and regional services caring about booked trains and mandatory reservations is considerably more recent than the phenomenon of advance 'Intercity operator & connections' tickets.
People got used to the connections being flexible. A lot of the time, they still are flexible, but there's no way for an average passenger to check. The non-enforcement of these restrictions most of the time makes the occasions where the rules are enforced, and passengers caught out, all the more unreasonable.
If I were the rail regulator I would not allow enforcement of the booked train only restriction on connecting legs shorter than 10 miles or on connecting legs shorter than 10% of the distance of the main leg, until such time as the industry works out a way of conveying clearly and accurately to the passenger whether or not they're actually going to enforce the booked train only restriction on each leg of the journey. That way, the passenger will know what to expect and will have the option to book a flexible ticket either for their entire journey, or just for the connecting leg(s) where flexibility is important to them, if they wish.
It really isn't good enough just to say "always stick to your itinerary on an advance" when the reality is there are many cases where passengers will not want to and do not, in practice, have to. It doesn't do anybody any good to have people hanging around on platforms waiting for their 'booked'(?) Thameslink train, unaware that secret guidance exists to the effect that they can take the first train that comes along.