Using the language of runes was just a proxy for natural spell casting; at least that was the theory behind it. To compare casting with runes with normal spellcasting would be like comparing writing code in C++ to writing code in binary. Where a unicorn would logically be able to sequence the transformation of magic as if they were writing in a C++ within a fully fleshed out Code Editor, the way Runecasting would work for me would be like slaving away on a Notepad trying to hardcode a barebones program in binary.