It’s just plain wrong to insist that if you tend to plate up (and again, I’m going to stress there are plenty of times when we don’t, depending on the food - mezze, Tex Mex, Indian, tapas, cheese and charcuterie, antipasti - these are all usually laid out on platters and in dishes for people to help themselves) that you’re automatically the type of person to be stingy, rude, domineering and mean-spirited with food. That’s just patently not true, and it’s lazy and small-minded to extrapolate from your vanishingly small sample to a country-wide population.
Neither my DH nor I have weird attitudes like that about food, and we always ensure we cook more than enough if we have guests. I, in particular, absolutely detest mean-spiritedness with food, and I also absolutely detest any kind of morality attached to how much or how little people want to eat. Policing what others eat is so far removed from what we’re about that I can safely say that you don’t actually know what you’re talking about. You may have experience with someone or some individuals who are like that, but that’s not been the case in my family over at least three generations of broadly doing it this way, nor is my DH’s family like that. And they’re a big family of boys, so they could well have quite legitimately tended towards it to make sure everyone got their fair share.
We tend towards plating up because that’s easier for us, fits well with our set-up, and it creates less dishes. Granted if we were living in our much bigger house, and not this small flat, and we had our big dining table which seats 10, a separate kitchen and a full size dishwasher, the proportion of meals that might be served in serving dishes would naturally go up, because I’d have that option more easily and it’d be more convenient in general. We’d also be a lot closer to family and friends so we’d do more entertaining and cook much bigger meals much more often.
Here’s a cat to set amongst the pigeons:
When my DH and I have big summer salads as our evening meal we don’t even plate up individually - we just arrange it all on one of our big pasta plates, sit down together and eat straight from that! Glass of wine each and job done! And amazingly, we don’t just shovel it all in without considering the other person, neither of us has disproportionately more than our fair share and we both come away happy and contented without any rancour or hostility or policing of how many bites we each had.