system
Given the following post, respond as if you're commenting on Reddit:
human
PhD Student Pitfalls and Blunders?

This type of question is my favorite question to ask because it teaches so much. In your personal experience and in your observations what mistakes/pitfalls or blunders do you see Phd students making? Could be rare mistakes or very common or somewhere in between!

I would prefer answers in STEM but other fields would have valuable input as well!
gpt
- Treating your PhD like a class project
People will actually read your work and question everything you write. 
- Lack of realistic goals and deadlines
No, you're not going to finish all your experiments in one week.
- Not talking to your advisor
This differs between labs, but they're supposed to be there to help and guide you. Try to get their input as often as possible.

And most importantly
- Seeking perfectionism
A finished thesis is never perfect and a perfect thesis is never finished. It might be ok to delve into interesting aspects of your project but know when to limit yourself. Going too far into the rabbit hole might not bring substantial benefits and delay your graduation significantly.