Look at what he is responding to.
Sorry, I was looking at the end of the first Teshuva, and didn't notice the second one, which is what he was probably referring to.
It's a Chidush to say that the only reason to ensure there are Eiruvin is for convenience and need, and today there is no major need, when the reason given is usually because of lhasir Michshol which would generally be understood to prevent accidental carrying.
By the way, I came across a nice video of Chassidim carrying their taleisim in Krakow (or Warsaw, don't remember which one), a few years ago. I have to find it.