To each their own no? Isabela on the other hand...not so much. As for not trying to control Isabela the ship incident can have Hawke make the decision for her. It just happens later than the other LIs.
Isabela calls Hawke as such in the whole saving burning orphanage conversation. (I think it's her act 2 questioning beliefs?). I did it a while ago I just remember being incredibly offputted by it.
The "control Isabela" thing isn't even really about Isabela. For a diplo Hawke (for example), it can be that Castillon simply cannot be allowed to continue enslaving and killing people. Izzy is willing to allow this to continue to happen, but her reasoning doesn't make any sense at all: she assumes that he will honor a 'business arrangement' and that keeping him alive would be better publicity, somehow, than killing him. Hawke can even point out that Isabela could get a ship in plenty of other ways, and Izzy whines that those ships wouldn't feel as special as one won from Castillon without killing him.
Isabela demonstrates throughout the story that she doesn't particularly care if other people get hurt (or killed)
because of what she does, so long as she's doing what she wants to do. Maintaining that illusion of total freedom and independence killed hundreds in the qunari invasion, and if Hawke lets Castillon go that number only rises. To me - and I confess that my favorite Hawke is a Izzy-rivalmancing Diplo female mage, so I am kind of invested in this - Isabela's potential return to Kirkwall at the end of Act 2 makes far more sense if she rivals Hawke than if they are friends. A friendly Hawke would only encourage the behavior that culminated in Isabela's departure: seeking freedom and independence, "looking out for number one", and forget the rest. A rival Hawke encourages the behavior that led Isabela back: a growing understanding that what she's done has hurt real people needlessly, and that she has to be responsible for helping to make it right.
I don't think that that makes rival Hawke a boring tightass stick in the mud. It's easy to see why Izzy would call Hawke that, but, y'know, sticks and stones.
And about that orphanage line: yeah, it is pretty funny. But, uh, Isabela was in Denerim during the events of
Dragon Age: Origins. While she was hanging out at the Pearl, a few miles away Arl Howe's goons were murdering their way through...
a burning orphanage. They killed so many elven kids that they practically sundered the Veil. I'm not suggesting that the line was meant as a direct reference, but it's a little close for comfort, no?