I can see how the lack of collaboration lead to the posthog.com website design.
Posthog is obviously successful. The design is good enough. But is it perfect? nah. would a better design make it more successful? highly doubt it.
If we were to take this feedback seriously, then we would've halted the launch and redesign the site. Now imagine having 10+ feedback like this. This would significantly delay the launch which would impact the success in a significant way.