I can think of a few reasons why a shift to the AO3 might be a good idea. A) It would allow participants to offer and/or request more fandoms without creating extra work for you. I know that there are plenty of smaller fandoms for which I'd love to write threesome fic (on the off-chance that another recipient requests it), but I worry about cluttering up your spreadsheet so I leave many of them off.

B) It would hopefully eliminate the problems with commenting.

C) I really like being able to go in and fix the typos that sneak past spellcheck and my beta, that I often don't see until after I've submitted my story.