It’s pretty good for self improvement. I scored kinda high on neuroticism but after learning some psychology stuff like mindfulness/meditation/neuroplasticity/stoicism/ACT i managed to reduce it significantly after about 2.5 years. there was even a study recently that showed how using a app to change your personality and it’s not easy and require serious training like learning a language or a musical instrument. I hope we will get eventually some open source version of that app.
and of course you need to be open to it, humans have a documented bias toward not believing what might hurt there self esteem.
The fact that it does not work out of the box is already a bug, why not open an issue on linux mint instead of endlessly trying to tweak things? (possibly a problem of unrealistic perfectionism tbh).
Linux is already mainstream (according to statcounter 1 in 25 people in the US use Linux). but hardware can be a problem and if you don’t check if your hardware is supported (or probably even better buying hardware that officially supports linux) there is a risk there will be problems.
With that said use what works, you are getting this for free and nobody owes you anything.