I'm sorry but i fail to see the logic in your frustration being pointed at Apple.
Since 1998 Apple have made it blatantly clear that one of their big strategies is a simplified product line-up. So i doubt that there'll be a 2U XServe ever.. That's for a market of customers that are big enough to have server racks but too small to have SANs and only a had full of servers ie. prime Microsoft territory - definitely not one of Apple's market slices.
Small businesses overwhelmingly use tower servers - eg. the MacPro.
Enterprises, media, .edu overwhemingly use 1u pizza or blade servers with centralised storage - eg. XServe (and yes they have server rooms, and yes they're set at 19-22 celsius.)
XServe RAID is pretty crappy compared to other disk systems - i guess it's lucky that you can use any SAN disk system you like, as well as any FC Switching infrastructure as well as external SCSI enclosures.
As for disks and prices, I only have experience with Dell, Apple and IBM in terms of servers, but all three of them only provide working bay-slot-thingies with ordered disks, have very high prices for disks, and useless baffles for the drive bays you didn't populate at purchase time.
In terms of 7200 rpm with Xeons - you're dead right and i'm glad they addressed this. 10k SATA would have been unlikely though as the only vendor is WD, meaning most box pushers avoid offering something they can't get an alternative off when price negotiations go bad. That's why you don't see many other workstations with 10k SATA disks from other vendors.