then you are saying it is working as the developers intended?
Please answer the question.
if the answer is no then its an exploit because you are doing something the developer did not intended
I will repeat myself for the second or third time pertaining to 'working as intended', with some added details:
considering devs have not made any indication towards:
changing how hex works
changing how trunda works as of now (including yumeko, trunda's A2)
then yes, that would seem to be this is their intention for the format.