You see that a lot Ben, great point, but it's also good to realise that when you are winning, submitting, keeping position, you DO learn stuff.
It's the same as "I stuck my arm too far over when attempting to put my forearm on the throat for a side control escape, and the guy Arm Triangled me. Next time, I won't put my arm as far." You've learnt an important defensive mistake that you will try not to make again.
"I was stuck in a really strong guys headlock when attempting to take the back and couldn't advance any further, but I used my legs to lockdown his knee and twist it, and he gave up the headlock to avoid the tap. In doing so, I was able to take his back and finish him from there." You've also learnt a way of taking a guys back, but you didn't lose, you won by experimenting with leverage, and it worked. It most probably will work again.
Keep an open mind, don't just say winning makes you learn nothing, because it couldn't be further from the truth.
I like to think of it as even if you do lose at a tournament, you still learn stuff, just as you learn when you win too. The mindset that people have where "losing is better" is not good, as you will not strive as much to win competitions, and you should really want to win these things. It just means that losing isn't the worst thing in the world