I use them because some buyers use them. If a buyer searches and your listing comes up in the search, the buyer may use an item specific on the left side to filter the results. Your listing will be dropped from the search results because it does not have that item specific filled in.
In my opinion you are just reducing your chance of selling your item by eliminating potential buyers from seeing your item. It may reduce it a little or a lot for you. No way to know.
I dislike some item specifics because they do not seem to apply. I fill in the ones required to stop eBay nagging me. Sometimes I have to put Does not apply or None.
With eBay, you have to adapt to their changes. It has been like that forever. The constant change is very annoying for buyers and sellers. Especially sellers having to redo their listings all the time. Too much time spent working on changes.
Please note that this is my buying ID so it has low feedback. I had another selling ID with much more feedback and sales over 10 years. I shut it down 2-3 years ago because of the constant changes and I was just tired of selling. It was not fun anymore. I now started selling again on a new eBay ID since January this year. Just casually for fun again. Selling personal items and items around the house. Retired in poor health so trying to keep busy in this pandemic. LOL.
