I much prefer people who can't be stuffed redeeming themselves. I would have LOVED to see Seska return some seasons later. She should not have died. We should know she is still out there in the Trekverse.
or having to be killed by a score-settling Chakotay for being such a bad-ass evil bitch.
This would never happen.
Though, there might be a Mr & Mrs Smith moment
Seven: I have reviewed Voyager's early logs, who is this Seska?
Chuckles: She was a girl I dated, she turned out to be a Cardasian spy.
Seven: Do you have a genetic sample of her?
Chuckles: No Seven, you're not going to get the Borg to hunt her down and assimilate her.