I understand what you mean. Using Camera Raw was a hard habit for me to break, but I went over to Capture One rather than Lightroom. I'm still learning very basic things with it, such as how to adjust the hue of individual colours - you can do it, but it is not the same as using the HSL sliders in Adobe software.
I also use RawTherapee, but that is definitely a 'deep dive'! It is useful for processing RAW files from my old Canon S60 and S70 compact cameras, with good results. To my surprise RawTherapee can correct lens distortion on these cameras.
Hope the mentoring goes well!