I am a PhD student in biosciences the U.K. and I am almost about to finish. I have a great relationship with my supervisor and overall they have supported me very well.
However, there are some things I think that he could have done which would have improved the experience; for example, going to a conference with them and introducing me to other experts in the field. Most of them are small points, but I think they would help any future students they have.
Given I am only a PhD student, I am hesitant to go to them with a checklist of improvements they need to make as a supervisor. Therefore, my question is, what is the best way to approach an advisor to offer advice on how they could improve their supervision without making myself sound too arrogant, or without giving unasked advice? Is there a way that would come off as being helpful rather than critical?