There are lots of reasons to open source internal software, and only a minority of them involve establishing a serious community and driving significant adoption. But the PR claim you're making isn't particularly credible. The ROI is abysmal if that's all you're after, and there are easier ways to get it.

Based on your specific complaints, it sounds like your opinion doesn't matter in this case; you're not the audience. You want support and a predictable future: you're looking for a product, not for technology. This isn't a product, and it's not a platform.

If instead you represented another company looking into solving this same problem yourself, and are looking at starting points, then you're the perfect audience. In that case, you'd have time and motivation to contact the developers directly rather than gripe on HN. You'd be less interested in whether there was an organized community, and more interested in how to directly influence the roadmap. You'd care about what the code looks like, how they solved Problem X and Problem Y, that kind of thing.