I once had a short conversation with a hotel receptionist and she said my Spanish was kind of basic but OK, yet my pronunciation was perfect. I do remember feeling a lot more confident after this.
I'm not sure it should be instilled as ruthlessly as you suggest but it does reinforce the fact that there are some things you just can't learn from an app alone.
I liked the ruthless correction because it meant that I didn’t get into the habit of pronouncing things poorly.
I also play piano, and if you make a mistake when practicing a piece, it’s easy to just keep making the same mistake over and over. The more you practice making a mistake, the harder it is to fix.
Flip side of this--many years ago, internet cafe in Shanghai.
Turns out the clerk did know some English--but her pronunciation was so bad that I couldn't understand her even when I knew what she was saying. I never saw a spelling mistake, though.
I'm not sure it should be instilled as ruthlessly as you suggest but it does reinforce the fact that there are some things you just can't learn from an app alone.