eeuuu...that polyester piece o' crap. That is about as unDruidlike as I can think. The only thing that ever came with a deck that I threw away
Originally I intended to make bags and spreadcloths for each deck I got. Then I realized how many decks there were in the world, and that some of them I wouldn't keep anyway, and that I didn't like deck bags, so I have about 8-10 double-sided ones. I love using them, but don't always. Depends on what and where I'm reading.
They certainly aren't necessary, but can help set intent for important readings.
And like Griz, the feel of silk gives me the heebeejeebees