What struck me the most is going with the old and tried tools (PHP+MySQL). Nowadays everyone - myself included - is trying to have an excuse to try the sexiest JS framework of the day and most of us fail miserably to deliver anything useful - because of lack of experience or just reinventing the wheel altogether. Old and boring is still sometimes the best.
Imagine your in the cleaning business and you focus all your efforts into making the most light weight durable broom in the world and one day you wake up and realise the guy with the wooden broom has all the actual business.
In this case some developers actual go further down the tool rabbit hole and start building tools that build tools..and they wonder why they fail.