I know you probably didn't mean it this way but, if you're asking what the ultimate datejust is and only 1 of the 3 options listed is a datejust... what I'm saying is that it's a bit confusing as to what you're actually asking.

Most mid to high dress watches will lose quite a lot of value. think blancpain villeret, Breguets, some JLCs, VC patrimony. The cool thing is a lot of the time these are complications too, so you can grab a blancpain triple calender for half the price of a brand new one from JLC.

the strictest definition of art I remember reading was: "Art has no purpose other than itself"
I remember reading this in response to a similar question about some cars such as the db5, E type etc.
So I would say no, but that's not to say that they aren't beautiful.

Definitely No. 3 for me. There's so many watches out there like the PP 5270 or 5172 or that I adore but I don't think I could ever justify purchasing or wearing out if i did own it.