Isn’t that what train splitter websites do...in which case many people will buy multiple tickets to save often quite a lot.
You need to know those websites exist, then you need to spend time working out what it all means and whether the all the warnings are scary or not.
Then, in this example, you need to decide if the fiver saving is worth changing twice, at stations you probably don't know, against just getting on a train and getting off at your destination.
And that's for people who have never read a horror story on this forum about advance split tickets being argued about in case of disruption.
I use a couple of the websites reasonably often, and I understand all of this, but in this case the direct journey would be far preferable to me.
Split ticketing is of minimal relevance unless you're an enthusiast / trainspotter. Being able to buy multiple tickets via other routes is no justification for removing a direct route.