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I personally find it way more intuitive to default the subverse combo box creating a post to the subverse you were browsing in when you clicked "Share link" or "Discuss."

At the moment it is blank which defaults to /v/all implicitly. This has caused me to accidentally submit to that sub several times already. I'm not against this being the default when viewing /v/all itself of course.

I believe this is the typical functionality in other reddit-like websites as well, so it should be natural for most users.