Funny
Oh sure, just disable, disconnect, and remove.
Except.... if you're using legacy applications and one-off home grown systems requiring it.
Then there are some industry apps which are so specialized they don't have competition... so they say FU to security requirements.
Oh, and let's not forget Apple's video need for it.
on and on.
It's great you just learned the IP stack, but wait to damn everyone after you have about 10 years of commercial experience first.
Sitting in mom's basement on your laptop, reading security magazines and attending a conference here and there doesn't teach you everything.
The fact you came up with an 'obvious solution' in less than 3 minutes should clue you into something.