Wow, great replies--this is definitely a real car site filled with true car nuts.
Seems to me that door frames would help make the body more rigid and would improve the general soundness of the structure in a side impact or if you were to roll the car. My old Plymouth hardtop also doesn't have door frames--but then that was for fashion (hardtops were based on the vert bodies back in the 60s--no B pillar either) and of course there's probably more steel in one door than there is an entire Legacy. I've driven the 95-99 Legacies and felt a lot of body flex, and when you close the doors it just feels like nothing. It just seems like a cost saving manuever to me. Then again maybe I'm just too used to 60s Mopars and 70s/80s Volvos...
Agree about the resale value. Comined with the AWD it makes them very attractive. I'm thinking of a 2000+ Legacy or 2001+ Outback. Again, it's the flimsyness of the doors and lack of side airbags that makes me hesitate a bit. I was expecting to see some improvement in the 2005 Legacy but other than side airbags it's not there. The stupid old Accords and Camrys do better in side impact tests and had side airbags available befor Subaru.