PTSD isn't universal. Not everybody that experiences trauma will develop PTSD. So it's not a matter of "you have PTSD but at least your outlook on life has improved."* Rather, sometimes with some people, trauma won't induce PTSD but will cause post-traumatic growth. Research suggests there is a correlation between PTSD and post-traumatic growth, but it's not a hard and fast rule.
Furthermore there are many factors in play. The nature of the trauma and the predisposition of the person experiencing the trauma both seem to play a big role in whether or not post-traumatic growth is likely to occur. People with social support networks or spirituality are more likely to experience post-traumatic growth. Perhaps for related reasons, trauma that is systematic or collective (such as being a prisoner of war) is more likely to induce post-traumatic growth than trauma which is personal or individual (e.g. sexual assault.)
(Furthermore, no matter how distasteful the possibility may seem, it is possible that post-traumatic growth can take people past whatever their baseline was prior to the inducement of PTSD.)
The point is, people with PTSD suffer and their lives are influenced significantly. They have harder time to keep jobs due to symptoms, their relationships are influenced as they are harder to be around, they are more likely to abuse alcohol or drugs, they generally need help.
Other people experiencing post-traumatic growth does not offset all that. It does not make for losses and answer to "is it overall beneficial for people to go through that" is still no.
Counselor answer suggests yes and that is what people take issue with. Whether one can have PTSD and post traumatic growth at the same time is different question.
The actual benefit of what you describe as growth is quite low to offset clinical PTSD which affects life quite a lot.