I’m glad you put that out there butterdori as I was thinking about this myself, but didn’t incase it was a stupid question and got the blame! Now you have that, lol.
I don’t have a clue whether it is possible to have tyres that degrade this quickly without marbles. Pirelli are probably working on this, although having said that, they quickly dismissed what Vettel and Di Resta have said on this issue.
I hope there is some kind of solution because drivers might not make as many moves because of how bad it is off line.
Maybe we are just fools, and tyre deg means marbles. I hope not though