It's certainly a legitimate question since the answer to your "struggle" is that not everyone plays the way you do. To you 2T of cargo space is preferable to a docking computer. To others the docking computer is preferable to 2T of cargo. If you try to rationalise the use of a docking computer from your point of view then you would struggle to understand why others do it. However, the problem is not the use of the docking computer but your trying to rationalise it from your point of view.
So, as for you leading a simple life, then I presume that you also do not use shields, planetary hanger or anything else that would take up your cargo space? After all, they are not strictly necessary either.
Although in my case, shields are essential.
I'm a terrible min-maxer, that's my problem. It would hit me square in my OCD to have the docking computer take up a slot when I CAN land manually, even if I was terrible at landing, my personality still would not let me waste a slot on it.
I too use shields, not because I bounce of stuff, though I do sometimes, mainly because I feel naked without one for some reason. Probably a deep insecurity thing, where's my 500mj blankie!?
Having said that, I have a contradiction for you too, I use collector limpets in my combat ships, for collecting the mats afterwards. This is a quality of life and immersion thing, really, as I find it ridiculous to have to run over 15 cargo items at 30mps one after the other. Plus I name my limpets (they're all called cargo-bob). I thank them when they bring me something nice, I scold them when they bring me worn shield emitters and I cry when they die.