a couple reasons.
for starters, it is not a real punctuation mark. some advertising guy just made it up in the early 60s. there are rules and regulations to the English language and you just cant make up a new punctuation mark. if you do, it will be short lived as is seen with the interobang.
it is a redundant sign as the same thing can be expressed with two signs that already exist.also, it is hard to make out in small sizes like 6 or 8pt font.
another reason is that the majority of the question marks out there will not allow for an exclamation point to simply be put over top of it. the symbol needs to be treated as its own design and that would mean that the interobang question mark will in most cases look extremely different than the regular question mark in a font family.
some of the original typefaces were painstakingly designed during the 16, 17, 18, and 19th centuries and are still used today with much enthusiasm. some people devoted their entire lives to type design and these were the people who set the foundation for type as we know it. to go back on their designs and add this bogus punctuation mark to their font would cause a lot of them to spin in their grave.
basically its a nifty idea but not very logical in the way of typography.
A language that is no longer spoken is known as a "dead language." These languages are no longer used in everyday communication and have no native speakers.
An idle suffix is a suffix in linguistics that is not currently being used or is no longer productive in forming new words in a language. It may have existed in the past but is no longer actively used.
"Thou"
caduc -- obsolete - null
The 'am' changes the meaning of the word 'used'.In the first one, it is the past tense of 'use'. In the second, it means 'accustomed', as in, something you have had experience with.You can say " I used to smoke. " or "I no longer smoke. "
150 octane Avgas (no longer used) 100LL Avgas 98 octane premium leaded (no longer used) 95 octane unleaded 82 octane regular (no longer used) 80 octane Avgas (no longer used)
freedman
The term used to describe someone who is no longer a slave is "freedman" or "freedwoman."
They are no longer used as they were very heavy than the present racquets. And they can be easily broken as they were wood.
It was used in thermometers but this is no longer aloud for obvious reasons of poisoning.Mercury was also used as a medicine for syphilis and constipation. Axiomatically this is also no longer done.
Tin and explosive power that is no longer used.
eht modnoc
it is no longer where it used to be
The term used to describe someone who is no longer a slave is "freedperson" or "freedman/freedwoman."
A yardstick is just a little longer than a meterstick. Generally used to measure distance.
A language that is no longer spoken is known as a "dead language." These languages are no longer used in everyday communication and have no native speakers.
A dash is longer. A hyphen is used to connect two words, to bring them close together. A dash is used to separate them, to push them apart.