I'm going to stay away from the "small talk" discussion and head back to resigning mid-game without a word.
Dominion is a society (the aggregate of people operating together in a more or less ordered community; an organization or club formed for a particular purpose or activity). Simple truth: in societies, our actions do not occur in a vacuum, they make an impact on others. Etiquette considerations (standards for making things go more smoothly) do not seem unreasonable in a society. The value of etiquette is easily argued, in business, families, online communities, etc. Some people see the value more than others and this is sometimes a result of upbringing or a result of maturation but I readily admit that some people will continue not caring what others think or not caring about the niceties of society for their entire lives. If it doesn't help them then that will be all that matters.
I ascribe to etiquette matters as an element of ethics. If possible, I want things to "go more smoothly." To me, it seems good/right/moral to want to generate good will. I will not take this too far and I always am interested to hear what others think even though I cannot be entirely responsible for what others think (they have to own part of that).
As part of the Dominion community/society, I stand resolved that I'd like to see it be a friendly and considerate competitive arena. To that end, I hope that etiquette is adhered to more often than not. Just as most of us feel the burden to not play too slowly because it can be annoying, I hope people will consider the possibility of playing through or commenting, rather than resigning without a word, if for no other reason than to make online Dominion "go more smoothly." It only takes a few seconds to generate that good will. I know, some will not be willing but I hope many will.