To your first point, not even that alone. People aren't paying (only) for stable and correct software. They actively seek out fancy UIs for example. I noticed

To your first point, not even that alone. People aren't paying (only) for stable and correct software. They actively seek out fancy UIs for example. I noticed that in a former company. We had the best algorithm and the most correct numbers (for what we were selling) but the customers didn't like them because they were lower (and more realistic) than some competitors' numbers. Also they had better and shinier UI, they won the market.