[Udo]

There is a reason why every one of those decisions needs to be discussed by a lot of experts for an extended amount of time, which apparently hasn't happened in this case.

But for what it's worth I strongly believe the <picture> concept has a core worth iterating on, the kinks I mentioned could be ironed out easily. Simplify the media query mechanism (there is room for extending it later) and get rid of the duplicate default declarations.

srcset on the other hand is a grossly misguided attempt by Apple to copy an iOS programming mechanism over to the web, it doesn't really have any merits by itself.