Aren't they still inherently 'scratchy' though?
I used one years ago at the previous house, as the trees under which I parked had fruit on them. I never had a sap issue (luckily) - but every two years, the fruit came and birds s**t it out.
Vile stuff - literally stained the roof and bonnet. I tried a cover (not exactly a cheap one either) which stopped the staining but I'm sure it scratched the corners where the elastic was.
As you say, things might have moved on though?