I'm also new to all this. I have been making many contacts on FT8. My script is set up to end with a 73. Whether it's "needed" or not probably doesnt matter to me. I'd say 90% of the time a contact ends in a 73 ( RR73 ) both ways. What I find is when the contact is at the edge of what I can pull out, the final 73 has told me the the contact really did go to completion. If folks set up not to give a 73 and all I get is an RRR, then I wonder, did it really finish.