In the GDC 2016 talk "8 Bit & '8 Bitish' Graphics-Outside the Box" by Mark Ferrari he mentions something similar. (paraphrasing) "If you can make anything you like (with modern Photoshop) you won't need to stop to consider the core of your idea." A lot of our thoughts are not as original as we like to believe and constraints can push your to consider your ideas and designs from another perspective leading to better understanding or design of the core concept. Often because the ideal path to realizing your idea is not available so you will have to reconsider the need or how to creatively implement something that approaches your desired outcome.
Now the GDC talk is about pixel art but the same is true in writing or any creative process (for example painting or coding). Famously some writers limit their selves to typewriters, for example George Orwell or Matty Healy.