Why incomplete subscript/superscript alphabet ?

[Doug Ewell]

>> Like «3ᵉ̀ᵐᵉ» ? It already works on my laptop (Thunderbird in Ubuntu
>> 16.04) The superscripted part is 1D49 + 0300 + 1D50 + 1D49, and there
>> is nothing to add.
>
> It does not render very well, the accent is not correctly positioned
> vertically (far too high) above the superscript e and colliding with
> the previous line of text at normal line-height, because fonts do not
> support this pair with proper positioning.

http://www.unicode.org/faq/char_combmark.html#12b

Poor display support today is not supposed to be a rationale for
permanently encoding new precomposed letters.
 
--
Doug Ewell | Thornton, CO, US | ewellic.org