Back at the start of skratchworx, I ventured to Musikmesse for the first time, and stumbled across the Mixvibes stand. The software at the time was at best fragile, but they were brave enough to let people play with it. And some 15 years and various products and versions later, their flagship software Cross DJ has been bumped to V4.
there are elements that contributed to failures in all of those that failed. (denon, vestax, some stuff from mixvibes-which is more of a morph than a fail, and countless softwares that were very good)
and last but not least, there is a big problem across all companies, where older people felt overwhelmed by technology so they turned to younger people for help, and somehow (with help from advertising companies) it morphed into older people letting younger people make WAY TOO MANY decisions, and really messing up the whole economy