There's a difference between merging and overwriting. Some sites work one way and others work another -- for example, for a long time, if you renamed a subject tag on LJ to a name that was already in use on that journal, it would not merge the two (this was intensely frustrating if you were trying to organize a lot of posts that had the wrong subject tag on them).
DW will merge posts in an import, but I can't find anything about merging new DW comments on posts that have been imported once and are being reimported specifically to catch new comments from LJ (and posts do have to be imported, not just comments, because new posts have been made to the comm since the first import). The single-journal import info suggests that certain things are overwritten by an import, just not posts that you made to that journal via DW itself, which are merged with the incoming posts. I'm not working with the community import page, but it's probably based on the single-journal import code.
Basically, since people stand to lose posts over the possibility, it's worth checking before assuming it won't happen -- even if it's your personal opinion that it's unlikely.
DW will merge posts in an import, but I can't find anything about merging new DW comments on posts that have been imported once and are being reimported specifically to catch new comments from LJ (and posts do have to be imported, not just comments, because new posts have been made to the comm since the first import). The single-journal import info suggests that certain things are overwritten by an import, just not posts that you made to that journal via DW itself, which are merged with the incoming posts. I'm not working with the community import page, but it's probably based on the single-journal import code.
Basically, since people stand to lose posts over the possibility, it's worth checking before assuming it won't happen -- even if it's your personal opinion that it's unlikely.
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