I would like to discuss about this question and as a result for every other similar that may be asked in this SE.
I copy paste here my comment after Mod Byte56 suggested.
The learning curve is a concept that measures how an average person can learn something or achieve a task based on the creator of the term Hermann Ebbinghaus. Focus on the word "average". This means that a learning curve is not an opinion-based concept. As for the limits, I think it's not the case here. Define if you can create a multiplayer game in GameMaker or not for example, is not an opinion-based answer as well. Please reconsider to open the question or point me another place to discuss it thoroughly. Thank you
Can you please share your thoughts?