IMO "died by suicide" trivializes it more than "committed suicide" because when you commit to something it shows intention. It shows the committer decided to kill themselves. I don't understand how that can be interpreted as trivial. By saying "died by suicide" it comes across as if they didn't have agency, it's as if their were a victim of certain circumstances, had no choice in the matter and that it was a foregone conclusion that they'd kill themselves.

With that said, I think it's all hair splitting in the first place. Whether someone says died by suicide or committed suicide. It's a tragic act and a tragic event and it makes me sad that it happens.