I agree it probably wouldn't result in a lower repair bill, but that's only one cost of appliance repair. The other major one, which isn't a big issue at the moment, but usually is... you have to be home when they come to service it.
Not everyone can work from home, so the shorter the visit the better. If the diagnostics are done remotely, they can arrive with the right parts and do the job more quickly since they already have a headstart from the diagnostics. Additionally, they should be able to complete the job in only one visit since they should already have the parts they need and not have to order them.
LG has a similar system too, and it makes sense for everyone. They save money on warranty repairs since their labor should be lower. Consumers save time on repairs for the same reason. They also get to drive repair work to the service company of their choice, which has benefits for them and has some pros and cons for the consumer.