I must admit I don't really know what the target market is for these type of products.
Having said that, my experience with USB in real industrial environments is that it is too unreliable. Industrial users creating bespoke systems need something robust and reliable, e.g. DIN rail modules.
Home users or hobbyists are sensitive to cost, so for example controlling something like a 3D printer would take 100's of Euros of modules, not cost effective nor compact solution. Buying a USB temperature module for 30x the cost of a thermistor looks crazy, to me.
That kinda leaves "toy" users, i.e. people who want to play with fun gadgets without a real background in software or hardware. They are willing to pay over the odds for a easy to use plug-and-play type system. For that, easy to use software is a key. That is a big chunk of work, if not more work than the hardware, not something that is a quick add on later. So it seems surprising to me that there is not already a software solution in place for these modules.
If the modules are being controlled by a dedicated Ras-Pi with a web interface, I'm not sure they benefit from being USB. If they idea is you can take the module and plug it in any old PC, then I am not sure where the web interface and Ras-Pi come in.
However, I do like the "Vaporware" section on the web site, if only more web sites were that honest!