The question is simply "is it inconsiderate to take up something you don't need to be using when someone else would like to/may need to use it?"
It's a bit like the table discussion, I guess: is it rude to sit at a table and read your book when people with food trays need somewhere to sit? Or if you've just taken money out of a cashpoint and you're standing in front of it having a chat when there are clearly other people waiting to use it. Same principle, really.
It's interesting, as I would see both of those situations as significantly different.
In the food trays scenario, if you are *just* sitting and reading a book, you are not using the [cafe / food court] tables for their primary purpose. In the cashpoint example, you are obstructing people from using something despite not using it yourself, which is rude.
In the parking situation, you are not doing either of those things. You are using the parking space for the purpose it is designed for, which isn't rude.
Of course some people are more or less able to park further away, and I think a lot of us have thought about what we personally
would do in the situation - I don't see any allegations of laziness, just difference in personal approach.
It looks as if some of the disconnect is that you start from the premise that you don't need o be in the space once you have your food, and that others do need to be there. A lot of us are saying that while you don't need to be there, neither does anyone else - so it comes down to whether you want to inconvenience yourself (albeit only slightly) rather than to inconvenience someone else, for whom the inconvenience may be greater or lesser than it is for you. After all, moving the car to a different street isn't difficult, but it means you have a delay before you can eat, a greater risk of spilling something in a moving car, he small risk that the other street may not be as quiet as usual and the hassle of manoeuvering in and out of two spaces instead of one. None of those is a major inconvenience, but equally, having to wait for a space or to park further away are not major inconveniences, either
I don't think anyone is saying that it would be wrong
to move, just that it is in no way rude not to.
I do think that if you (general you, not you personally) were on the other side of the scenario and were wanting to get into the space, it would be very rude to expect / demand that someone sitting in their car and eating should move.