For me, the whole point of rail is that I get to my destination more comfortably, and am able to do something else during the journey (e.g. work on my laptop). I don't mind if that's a bit slower, or takes longer, than in a car.

For those who travel for work and business, time matters a lot, especially when you start to add the times to and from the train station at the source and destination. If rail ads 2+ hours more versus car, that's 2+ hours less you can be with your family that day. If you're travelling for vacation, those 2+ hours means you might miss out on a flight that's only once per day. And so on.

That's a different question to "why can't we have that"