Indeed - many readers of this forum will be aware that an unoccupied seat marked "reserved from Par to Totnes" is available for them from Exeter to Reading, but the geographic knowledge needed is likely beyond people taking a touring holiday in the UK▸ . And is a seat "reserved from Chippenham to London Paddington" available for a passenger from Newton Abbott to Bristol Temple Meads?
If it's one ofd the few trains routed that way, yes.
Electronic / updating systems can clarify some of the concerns by removing expired reservations
But ios of zero help to those travelling beyond the next reservation!
For example, a train might be reserved from Bristol to Chippenham & from Swindon to LOndon. On a paper reservation ticket, both reservations can be easily seen so someone boarding at Bath for London & finding no seats available will know that the seat they are looking at is reserved again from Swindon & it's really worth taking it at Chippenham.
On an electronic reservation, it only gives you the current reservation, so if it were empty at Bath you'd be thinking that the passenger hadn't turned up & it was free. It wouldn't be until Chippenham that the next reservation would show as reserved from Swindon & you could easily get thrown out for the last hour of your journey. Paper reservations are better on long journeys were one seat might be reserved multiple times!