1/ The biggest hindrance in building any product is noise from outside. It is from people who are not using your product but giving advice.
2/ Losing focus comes next to noise. It is very easy to get lost for winning customer and losing a circle of competence.
3/ Quick growth which means scaling, hiring, unpackaged product development and unclear moats.
4/ Marketing which should be the word to mouth by delighting customers turns into social media ads.