Actually they are rather dry in comparison to the orange flesh ones.
The need lots of butter which defeats the object.
A) They might be worth roasting (an easier fondant?) - I love roasted white fleshed ones - you get a superior roast potato. I hope they have more flavour than most blue potatoes (there are exceptions like Vitelotte Noire).
For me, the orange ones are pointless - they never taste as good as a carrot in the same recipe, I don't care if they are more healthy (probably not, actually), I'll compensate by eating carrots twice as often. Squash/pumpkin is the same, though I like it shredded raw because carrots aren't at their best shredded (a bit stringy in coleslaw).
B) What's the object of eating less butter? All the current (& much more scientific) evidence points away
from fats as being the real bogey.
It's looking more and more that even junk food (which I hate) does most of it's damage by making you eat less fruit & veg.
It also seems to make a lot of people less active (making poached eggs on toast seems to be more exercise than a lot of people want).
PS. It's not what you eat that kills you*. What's risky is not eating the good stuff: (only true now that man-made trans fats are outlawed - pure poison).
I should add that to my signature, except there's not enough room.
*And sofas of course... as in the brilliant advert.
I'd also like to add that "Any policy based mainly on puritanism always, always turns out to be wrong".
And before you quibble I'd point out that exercise is FUN, though something of an acquired taste.