This particular system is a bit cumbersome in some ways but I’m used to it and don’t care if they change it. It accomplishes what it needs to without me having to worry about accidentally selecting characters I don’t want selected, though I agree it isn’t fast at all.
However, this looks like a decent thread to mention the AI issues I’ve been having with it. Enemies appear to think unlinked characters are not in the same fight, even though all characters are shown in the same initiative order, causing them to prefer outright killing unconscious characters rather than attack others that can fight back.
