Why I advise against calling the digit 'X' "dek"

Most people want to call the digit 'X' "Dek", but as you may (or may not) know, I would prefer "ten", and here is why:

It is pointless

I understand calling it dek if we call 10; "ten", but most dozenalists know that it is a bad idea to do such, as it would cause a lot of confusion. So why change the name?

It is sometimes a mouthful to say when in groups of numbers

Try: 1/7 (0;186X35186X35...)

(Though I propose 'E' to be "eleven", which is also bad for a digit, but it can be called "elv" to solve this problem)

It isn't really English

I do understand Latin 'decem' for prefixes, but I'd rather keep number names Germanic in origin