Do the TOC’s and other parts of the rail industry that rely on customer revenue hate split ticketing? After all, the reason we split ticket is to save money and provide greater flexibility in our travel plans, both of which the revenue reliant sections of the industry that enjoys placing massive restrictions on tickets in order to maximise inconvenience to their customers hate?
'The TOCs' as a whole? No; it benefits some of them!
Split ticketing is likely to increase the revenue of some TOCs such as West Midlands Trains, Northern etc.
In other cases it probably helps with yield management, for example XC appear to set prohibitively high through fares, safe in the knowledge that a few people
are prepared to pay that premium but also knowing that some more savvy passengers are going to get a cheaper fare by splitting. If they simply reduced the price of longer distance journeys, they would lose the premium that some people are prepared to pay. They cannot increase the price of shorter journeys, but perhaps XC would lobby for such increases in the event that fares ever got reformed; who knows...
Yield management is all about getting as much money from each passenger as possible; some people are much more price sensitive than others.
Split ticketing in many ways benefits everyone.
Also don't forget that split ticketing allows non-permitted routes; it's not just about reducing costs!