I think the answer by teika kazura on the linked page explains pretty thoroughly why this is not “good enough”. Most importantly:

> In Unicode the letter ℘ is given the codepoint U+2118 in the block "letterlike symbols", named "script capital p". But in fact it's lowercase.

Unicode technical note https://www.unicode.org/notes/tn27/ clarifies:

> Should have been called calligraphic small p or Weierstrass elliptic function symbol, which is what it is used for. It is not a capital "P" at all. A formal name alias correcting this to WEIERSTRASS ELLIPTIC FUNCTION has been defined.