There is also another reason that makes the composing characters very convenient right now. Many of the existing typefaces, even some that are quite expensive,

There is also another reason that makes the composing characters very convenient right now. Many of the existing typefaces, even some that are quite expensive, do not contain all the pre-composed characters defined by Unicode, especially when those characters have been added in more recent Unicode versions or when they are used only in languages that are not Western European. The missing characters can be synthesized with composing characters. The alternatives, which are to use a font editor to add characters to the typeface or to buy another more complete and more expensive version of the typeface, are not acceptable or even possible for most users. Therefore the fact that Unicode has defined composing characters is quite useful in such cases.