I believe the Nitei Gavriel notes that over time the reality is that people have accepted canvas style walls as long as they “stand up” to a “decent” wind and are properly secured.

It seems to me that this is a matter of hanhogo now, as he notes. Some people will not allow these in their abode, but would eat at a succah that had such walls. Others would happily have these at their own abode. Others would not have them or use them elsewhere.

Either way, it’s inconceivable that somebody who is happy with such walls would not use them if there was no hechsher specifically as a result of their use in an eatery. Similarly, it’s inconceivable that somebody who will never use them will all of a sudden use them at an eatery because a hechsher has said they could!

I do hope this doesn’t come down to a “denier style” stocking definition where we have Mashgichim who measure the amount of flap in a given wind strength. Or, “Kosher for those who eat in fabric Succas”. Sigh.

I’ve seen plenty of Succas with such walls survive a challenging wind yet at the same time the Schach on that same Succa has taken flight.