Progress is cool. Try it. If you're honestly going to argue that codepage 437 is better, then you must be replying to this thread from a BBS program and running MS-DOS 5.0, because 6.1 is "just too newbish".
Armok I was a full 3-D game. Its development was ceased because working out the graphics for each level of detail young Toady wanted was too much work.
Toady is a developer, not an artist. He has no obligation to make his game any easier to use. Any graphics he make will dissatisfy a lot of people, especially after spending 8 years building up an identity as an incredibly in-depth modern ASCII game. Using a fixed tileset has a lot of advantages in development speed: you never need to draw a single tile again after making the set, third-party tilesets don't need to update if they use the same standard, and if it's abstract enough you can get away with anything. Toady got away with using the alphabet from a public-domain character set for over 200 creatures. Graphics pack makers have to draw every last one of them. Toady wins.
Here are all of the tiles that are completely unused in the latest version:
◙ ↕ ∟ ↔ ₧ ª ¬ ½ ¼ ╢ ╟ ⌡
In the next version, the ¼ glyph will be used as tree foliage, shrinking the list to 11 characters, plus the blank FF tile. 244/256 is actually a pretty good fraction of used tiles...
And locating anything is a moot point when tilesets can only include one interpretation of what a tile is used for.
"And in the meantime 94 goblins just popped by to say hello and you can't find their home fortress on the world map because it's a little pink cabinet and it's in TILESETS, GODDAMN TILESETS."
"And in the meantime 94 goblins just popped by to say hello and you can't find your fortifications because they're normal wall intersections and it's in TILESETS, GODDAMN TILESETS."
"And in the meantime 94 goblins just popped by to say hello and you can't find your gear assemblies because they turn from suns into ore-bearing rocks and it's in TILESETS, GODDAMN TILESETS."
"And in the meantime 94 goblins just popped by to say hello and you can't find the clouds because they're little pieces of dried leather and it's in TILESETS, GODDAMN TILESETS."
"And in the meantime 94 goblins just popped by to say hello and you can't find your highwood plantation because they are all green mugs and it's in TILESETS, GODDAMN TILESETS."
Here's an ASCII set to really piss off graphics users. Spread the word!