Can I ask if there is any real benefit to the Wii U using this type of memory?
1) It's faster.
2) Less moving parts, theoretically less chance of breakage.
3) No noise.
1) It's faster, but if 7200rpm HDDs are good enough for the world's greatest gaming PCs, they're good enough for a console.
2) 'Theoretically' less chance of breakage. I say this because I've had many flash cards and SD cards which crapped out. Just stopped retaining things. I've never had a HDD fail (which is not to say they don't). We have an old-as-the-hills lappy (10 years old), and the HDD whirrs loudly - but it still works.
3) Though they produce noise, HDDs are quiet enough. An internal one would produce only as much noise as the disc drive, probably less.
4) Puny amount of storage per penny compared to HDD.
For the same money, they could have kitted the 'U out with an internal 500GB HDD, and you'd never have to worry about storage. For reference, I have a 120GB PS3. Three years on, and I'm always deleting things to make way for new things. You can believe that 32GB is a rather pointless amount of storage in this day and age.