There's some downsides to this - I can't recall where I called this out off the top of my head, but this also adds a bunch more things that that wouldn't do that are covered in the spec.
If you mean your proposal adds more things, that sounds like it might be over-complicated. To solve the problem of tightly-fitting boxes around terminal text -- if you consider that to be a real problem -- overstrike sounds like a really elegant solution.
If you mean your proposal adds more things, that sounds like it might be over-complicated. To solve the problem of tightly-fitting boxes around terminal text -- if you consider that to be a real problem -- overstrike sounds like a really elegant solution.