That's valid, but saying that a product a few developers created for FREE, and made open source so anyone could copy and change is the "wrong thing to copy" is just disrespectful.
It would be disrespectful if thats all they said, but including "it would be nice.." and "...imho" changes it to politely giving their opinion on a third party forum. If it were a show hn, or the projects own forum I might agree with you, but this is the appropriate place to give armchair opinions.