This response, to me, misses the point. Yes, you gotta play the hand you're dealt. It's not crippling at all to acknowledge the cards in your hand. If you don't have any pairs or face cards or whatever, it is not crippling to acknowledge that. Acknowledging the help of other is not telling ourselves we're succeeding because of "what we were given", and acknowledging the role of chance isn't denigratory either. To me, acknowledging what others helped us with, the chance encounters that helped, etc can help us seek out more chance, more help, and then provide that to others as well. Then we can indeed make our own luck and create luck for others.
Acknowledging the help of others is just not at all the same as lessening our own contributions.
I guess it is true that some folks see it that way, that if you ever thank or acknowledge anyone else then you're weak, there is this pressure to pretend that everything is original and done alone, but... that's just lying.