This bugs me a bit. I understand that technically the advisor or supervisor relationship may be a bit different from the more senior-level collaborations, but I can't help but think when I see people say "thanks to my supervisors/advisors for their help with this project" (i.e. on Twitter press-releases of research, at the beginning/end of presentations at conferences) that it is a bit infantilising... I am not suggesting it is a particularly important problem, but from many PhD students I know and from my own personal experience, the supervisor role can certainly be very much equivalent to normal collaboration between other academics. I think it makes a PhD student sound more independent and capable if they were to refer to their co-authors on papers published during their PhD as their collaborators - even if they are in fact their supervisor/advisor.
Keen to hear others thoughts!