From the discussion going on it might seem Clarity's view is a one person opinion only. It isn't.
I was delighted to learn about the possibility to boot a puppy (or even an ubuntu) simply from the iso, and disappointed if it didn't work with some puppies, lacking that loop device.
Now developers say it is deprecated, complicated, for old timers. I have some understanding for their thinking and don't mind generally switching to img format.
But from a user's perspective it would make me unhappy to lose the ease and flexibility the current system provides.
If with a new format all the existing advantages can be retained all will be fine.
Had to say this.
dellus,
Puppy fan and user since 2.14, not a coder.