Should you still play to CHM - even if you're certainly to lose

Some chess coaches advise a player who's chess needs work, should never resign as a loss? Apparently playing on to the checkmate move is necessary to understand what you need to do to improve?

Others might claim you never know your strengths/potential to come up on top from behind?

Or is it in some cases bad sportsmanship to deem your player the winner by resignation? On this site it's not as long as you hit the resign button instead of leaving your opponent waiting through abandoned play.

Yeah I'd be interested to hear any debates about this matter in particular f2f experience matters and/or funny outbursts of petty sportsmanship relating to this if relevant?

"f2f"

What does that mean? Female to female?

You can resign as a loss. Learn the moves to the loss. That is what Aunt Bee told me.

Sorry f2f means face to face

I think a good test is that you believe you have lost, you know why you have lost, you believe your opponent is able to convert their advantage, you believe you have nothing to learn from watching them do it, you dont wish to play on. If all these are true then resignation is appropriate.