That wasn't an opinion dude, you were demeaning him and his idea and it will be beneficial to him as he will improve his skills and maybe because a professional. If that is what you call an opinion, your opinion is wrong.
Don't be so harsh.
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If he releases it, then other people can pick apart his code and tell him where he needs to improve etc.
The people in the thread could give him ideas for panel features that he'd never have thought of otherwise, so he'll end up with a much wider skill set afterwards.
I'm not sure if the last bit made sense, but I'm too lazy to reword it.