In the case of Germany and German you'd at least have to go down another century to find the first attempts at standardising the spelling.
The German language is strictly regulated, possibly even more so than present day French.
Contrary to many other European languages for phonetic reasons they decided to change out the Latin leading C to a (greek) K but also felt the need to retain the Latin 'a' that's in German plural phonetically an 'e' by adding an Umlaut: ä.
It's this partial wish to retain compatibility with original Latin and Greek words and the slightly different phonetics to Latin and Greek that is so difficult to incorporate into Germanic languages.
English is a whole different matter, the English phonetics changed drastically from their Germanic roots during/ due to 'The Great Vowel Shift'. Strange enough the spelling remained basically Germanic but the pronunciation is nothing like it used to be.
This vowel shift is even more pronounced in American, the (a?) reason they have great difficulty in comprehensively speaking European languages, including Church-Latin.
So the results of the suggestion to allow phonetic spelling depends greatly on the alphabet used, Germanic, Latin, UK-English or US-English are some of the options.