It's not possible to auto quote in Google Groups mobile interface. That's a serious problem and makes posting from a mobile device impractical. I don't see the connection myself.

Mostly, people on newgroups just get upset whenever they see a post not in the format they expect. I suspect it's a personality defect and these folks simply have a hard time living in this new age.

Why these really old post appear is kind of a mystery. Your best bet is to study the folks that post them. Typically, they'll make a single post on a topic and disappear. My assumption is that it's some kind of research project on how people react to this situation. Perhaps these things are being posted by the Russians or Chinese i.e., the commies.
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Very true. I don't use my laptop much anymore, maybe once a week. I like my laptop a lot, but I like my phone more.

When I want to post something here, I copy and paste what I am answering. It's not that hard to do, but as dsi1 said, it makes it impractical if you want to do a lot of posting.

Nellie