Issue with system design is that our industry is so highly opinionated about things. You design something to the best of your abilities, it works (though may have its pros and cons) and then you go present it to a crowd of engineers (HN, say) ... and you get destroyed. There will always be people telling you that these were dumb choices and that that's obvious. And if you go and do what they say is the obviously better solution, then the exact same thing will happen with another crowd.

Our field is too immature to actually agree on things being good or bad.