Yes, in my (admittedly limited) experience they take the blanket off you in J too, as mentioned above. I appreciate that the crew have a lot to do but I was very cosy in my blanket and they took it from me well in advance of landing.

Presumably blankets all over the place would slow down an emergency evacuation? Or is it just that it helps with the turnaround to have the blankets ready to be offloaded?