How do you know someone has written it all and is posting serialized? (Other than them telling you.) I mean, I guess I would notice if they updated one day apart or had an amazing schedule they stuck to for 50 chapters but I follow a lot of WIPs by email (I've been burned by eternal-unfinished WIPs but I've also read a lot of awesome ones, so I keep doing it) and there's no way I could tell.

In your case, since you do like many aspects of serialized writing, I agree: that compromise wouldn't work for you.