It is not given to me to be picky but I feel we must look on advent calendars in their position in things.
My D is now 52 and I had never heard of advent calendars until we moved house when she was 2.
Our neighbour who had no children bought her one for the first Christmas in our new home. They were certainly not widely available as they are today.
She and her brother who followed later always had the window type opening with a cracker, a bell , a tree ornament and the crib scene on Christmas day all their child hood.
When chocolates came in I do not remember but come in they did followed by cartoon characters and tv shows.
Now come the expensive ones featuring cosmetics and alcohol.
It is progression and progress, we are not tampering with hundreds of years of tradition.
I have bought, for myself the M&S one and I look forward to my little treat everyday through December, which has no religious context , just me pampering myself.
As the advert says at the age of 80 " I deserve it".