@obolig I appreciate that @Christoph-Hart has been a lot more active on the forum here. I may be in the minority in thinking that HISE doesn't need any more features – just more information about the ones that already exist. There's more than people realize, with direct access to FFT bins being the universal Turing machine of DSP.
In terms of companies using HISE, within the context of the ones I work with and advise, there is potentially significant interest in the JavaScript engine (not the sampler elements). From my perspective, the outwardly-facing obstacle is that there simply needs to be more than one person behind it to provide the necessary stability, maintenance of knowledge assets, and overall mitigation of inherent risk that is inherent with incorporating external systems into existing commercial ecosystems.