My PIMI mother recently passed away. I gave her a witness funeral, as were her wishes. The brother who gave the funeral talk used Ecclesiastes 9:5, which says the dead have no conciousness. He, of course, used the NWT.
My Bible, The Living Bible, has a footnote for that scripture. It says, “this scripture reflects Solomon’s discourage opinion at the time. It does not reflect God’s truth on the matter.”