Bottom line: If the new version filters as well, or better than the old, then the mesh is not necessary. But I'm conceding you are correct in that if the old media was not rigid enough on its own, then sure, the mesh would serve a purpose.The Ultra with the metal screen backing has been around for many years, so don't know what you're getting at with saying "unless the new filter media was not yet developed". They are two entirely different media designs between the two configurations.
So if the new media is a technical advance, then you are right again, it was necessary before. But if not, then they could have engineered it before without the mesh. In that case, the mesh really wasn't necessary to achieve the desired filtering efficiency. So why do it? I suspect if that's the case, it was to make us all feel that the filter is stronger and will withstand greater pressure.
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