Just ignore them. It's a minor annoyance.
But do think about those Recommended Item Specifics.
They don't all work for every item, but they are used by Google and other search engines to find your item when someone is not shopping on eBay.
You can use as few or as many as you like.
You may also find they remind you to tell your customers more precisely what you are selling.
Not just a frammeljammer but a purple frammeljammer Vintage 2002 and Made in Uzbekistan which is as we all know famous for its handcrafted frammeljammers.
The Required IS as you have noticed must be used or your listing won't upload, but you can put Not Applicable in some of those and it will upload just fine.
"Feel free to contact" is fine-- but if someone asks you a question, Revise the listing to include the new info as well as answering the Message.