This is about FOSS and I can't see that Audiotool is FOSS, and Samplers are not Sample Libraries. Sample Libraries are ubiquitous among producers who want a good sounding recreation of a real instrument but cannot afford (or morally support), for example, Pianoteq's modelling algorithms or Spitfire's premium libraries, neither of which are FOSS, or the instrument itself or a session player.

As I said, the most promising multi-sampler or sample library software with an active community was Decent Sampler, which isn't open-source and now supports DRM.

You're correct but in my experience everything I've used at a venue is analog, running almost entirely off of the mixing desk, without an external computer running Win/Mac/Linux. And half of these consoles I've used had a USB port which was used for, among other things, storing templates. This allowed for our front-of-house mix engineers and monitor mix engineers to cruise along because most of the work was done at home or in other venues. The software for writing those was Windows/Mac at the least, I don't know if any used Linux and I'm not sure if they were "human-readable" text formats.

At that price point I'm not so motivated to work on something FOSS, I care more for working with the hand-to-mouth musicians than the large institutions.