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.

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iainmerrick a day ago | parent [-]

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.

	▲	joshka a day ago \| parent \| next [-]
		Which things do you consider in your experience of writing tuis that are mentioned as being wanted in the blog post / rationale doc linked to be unnecessary? If you want those things then overstrike is insufficient.
	▲	zem a day ago \| parent \| prev [-]
		cell borders sound even more elegant imo, they are a targeted, precise fix for a useful feature. overstrike sounds messy to me though I can see where it has a lot of uses.