Well, yes and no.
The beauty of DE is that you can add and remove any size HDD at anytime without having to rebuild your RAID. You also don't have to worry about about data loss when removing an HDD from the pool. DE will automatically move files off the drive you plan on removing assuming you have enough space in the drive pool. Added to that is the ability to automatically enable Raid 1 (duplication) of data on a folder by folder basis. Thus having the benefits of Raid 1, without having to waste redundancy on files that don't require it. And still with the freedom to add HDDs of mismatched sizes.
DE is an absolute thing of beauty for a home storage server, IMO. Hell, if you go to forums where building WHS boxes is common, people are building 30-60 Terabyte storage servers. It's become very popular for small businesses as well as home installations.
One particularly interesting solution I saw was a 60 TB machine running Windows Server 2008 with 7 virtual machines for various tasks. One virtual machine was running WHS as a storage server using most of that 60 TB capacity which then served as the storage server not only for his network but as network storage for the other virtual machines.
Most people universally question why MS are removing arguably the best feature of WHS.
Regards,
SB