Heh. I can accept that the inner works are locked down, but I wish we could edit the metadata. Some of those Substance Share archives have essentially no searchable data or even thumbnails. I downloaded a fair number, but odds are I'll never use them simply because I can't find them or distinguish them from similarly named substances in my library.
Since I can't add metadata or decent thumbnails, I can't fix the problem myself. I'll probably load them up once, as a reference for building my own version I can manage.
NEway, that's just my two-cents.