<snip>it prevents any single account from becoming too firmly entrenched in DT1. And you know what they say, absolute power corrupts absolutely, and we've seen that more than a few times around here (not mentioning any names, you'll have to use your imagination).
Oh, I've certainly seen DT members abuse their positions for various reasons but because other DT members can keep abusers in check, any corruption of power (absolute or not) is--or should be--corrected by the system.
The way it is now, I have to wonder how many members on the list should really be trusted by default. Maybe it's working out better than the old way, but way back when I was first put on DT2 it was a big deal to add any new members, and their trustworthiness and overall reputation were scrutinized before their DT1 "sponsor" included them on their trust list. Perhaps I'm being too pessimistic; the rotating system has been in place for quite a while and there haven't been any disasters that I know of.