Tesla's FSD problem isn't the technology, it's the positioning. It's genuinely good at what it does but selling it as "Full Self-Driving" set an expectation it can't meet. If they had framed it as the best safety feature, always aware co-driver watching out for you, people would trust it far more and adoption would be much higher.
I had the exact same experience with my web app, about 10 years ago.
My conclusion was that productivity forums are more of a support group than a place to find users for new concepts.
I built an app that is 100% flexible to adjust to how you want to work, and I think most people expect such an app to tell them how to work and it has to be simple.