Let’s avoid unnecessary generalization. You claim it is broken, others haven’t. We’re always interested in improving our software, but, for what it’s worth, we don’t care much about public opinion. It’s open source software, if they don’t like it, they can fork it and change it, or avoid it. It’s a free world 
As for the way RT works: the auto-matched tone curve option is enabled in the default processing profile, because in many cases it gives you a good starting point for further editing. But that’s precisely the point: it’s never meant as a one-stop tool, YMMV. You can choose an even more barebones starting point by starting with ‘Neutral’, which has all tools disabled. Or you can make your own processing profiles to accommodate your specific needs.
The point @Floessie made is that there are ways to improve the color rendition of RT when things are sub-optimal. Providing shots to create a DCP profile that we can ship with RT is a very good way to do that. Please see the provided link for details.
I assume you have found our GitHub and know that bugs and feature requests are tracked there? This forum is for discussion mostly.