"Line-drawing characters" are an object of your font and character set, not your terminal. In particular, they're used commonly in the IBM PC extensions to ASCII.
Not just that. A genuine DEC VTxxx terminal and a good emulators of it (like xterm) has also a line drawing character set, enabled by a certain escape sequence, and there are lots of "legacy applications" that use it.
By the way, xterm still beats every other X11 terminal emulator I have tried in terms of stability and quality of emulation. Even the resource use is less than in most newer competitors, except rxvt. Since a terminal emulator is something that just needs to work reliably, no eye candy needed, xterm is the best. I don't see any point in reinventing this particular wheel.
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