What was the fundamental limitation shared by both quills and metal dip pens?
Answer
Complete dependency on an external source of liquid ink
Both quill pens and metal dip pens were dip pens, meaning the writer was tethered to a separate inkwell and had to constantly pause writing to replenish the ink supply.

Related Questions
What maintenance was required for a quill pen during writing?What feature did metal dip pens possess to aid ink flow?What was the fundamental limitation shared by both quills and metal dip pens?What action often resulted in a dreaded ink blob when using fountain pens?Who is credited with developing the practical, commercially viable ballpoint pen?What characteristic of newspaper printing ink inspired Bíró's design choice?What key innovation allowed the ballpoint pen to dispense ink without capillary action or gravity feed?What significant issue did early fountain pens struggle with, particularly regarding travel?What advantage did pencils offer over liquid ink instruments for informal writing?What process was used to prepare a goose or swan feather for use as a writing tool?