I say it is bad concept because if you want a volt or current sensor, you have to fit a big bulky and very expensive MUX box. The size makes it impossible for many gliders or smaller models, and the cost makes it silly to buy several for multiple larger models. With Multiplex you can fit tiny sensors into small models and just daisy chain them, and can aford to fit sensors into many models. Also Multiplex has always made their sensor bus open source precisely to get the benefits you mention. Multiplex supplies the data to anyone who asks and wants to make sensors for their system even though they make a big range of sensors themselves. If a considerably bigger German firm like Multiplex thinks open source sensor bus is best even though they already make sensors themselves, I can't see a good reason for a smaller firm like Weatronic who doesn't make sensors, to choose not to.