Is power creep an objective term? If so, would you assign your own definition to the term power creep or would you take the definition from professional game designers with lots of experience from the gaming industry?
Here are Extra Credits' videos explaining power creep:
Power Creep - The Trouble with Expansions and Time - Extra Credits
Power Creep in Hearthstone - What It Teaches Us About Games - Extra Credits
If you say it is not an objective term, why is that?
I would say yes, it is an objective term, and I would take the definition from Extra Credit since they are game designers and I am not.