I'm actually experimenting with a pixel art +(PETSCII-like) tile based graphics editor for Adventuron (with layers). For sure the vector style is limited, but it's a really fast and byte efficient way to build a scene. Think of all the iconic "The Hobbit" graphics that were entirely constructed with vectors.
For those of us who grew up with 8-bit text adventures on machines like the Spectrum or Commodore, vector art is a key part of the medium. The slow line & fill systems, a necessity because of the lack of memory on tape-based machines, produced some very rudimentary, but very memorable images.
I could never do anything decent with those systems. Mind you, I also could never do anything decent with pixels! :)