I agree, this is an excellent summary. I hope Nutaku picks up the pace in the future.
pastebin.com/Na7EUXEt
Sorry to shoehorn it here, but if it helps, I also had made a big list of DMM updates a while back. It's outdated and doesn't list exact dates, though, so the OP summary is better.
Does super counter count as a missing feature? Basically, if a unit counters and the defense shield activates, the counter should be more powerful. No idea when this was added to DMM. Also, there is the crit rework, which I believe makes it so that you can crit against enemies you have type advantage over. Again, no idea when DMM got this. Can try to look into it when I get home.
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