I give 6 calls always if I can.
Reasons..........
1) if the 6 call works the nme now has at least 2 of us to worry about.
2) if the 6 call works this person may end up clearing my 6 or at least calling it.
3) i've watched groups, and flown with groups, that fly with little or no 6 calls, or at least as near as I could tell rarely gave em, and most got shot down in very short order and I followed them in getting shot down not too long afterward cause i was suddenly outnumbered and in deep doo doo. And in some cases we out numbered or had pretty even numbers with those we fought.
If I don't get a 6 call? If I get popped tryin to clear a 6 with say 3 or 4 friendlies behind me or all around me as well?
I fly somewhere else...... If this lack of 6 calls continues I will log for awhile. Or I will fly very high alt and hunt.
I left the Bishops and the Rooks because they very rarely gave me any 6 calls.
Some look at it as if it's a courtesy, or a bonus, and nothing more, I do not.
Gettin a 6 call late is ok with me. Means the others are trying to fly with teamwork.
On the other hand if your attitude is "it's everyone for themselves" kinda thing, hey I can hang with that, cause i'm outa there, i'm grabbin and I'm no longer worried about you. If you're such a hot pilot and don't need teamwork, if you're gonna shoot down the whole rook or bish airforce? OK
I consider 6 calls to be right next to gunnery and acm in that it aids in survival for yourself and those around you.
I've also noticed here and there people that don't seem to give very many 6 calls, or even none, sometimes cry the loudest when they didn't get one and got popped.
But then I fly with the intention of RTBing every sortie.
Some do not.
That's my $0.02