I don't know the answer to the quaantity vs quality answer but my hen is a lot cuter with the chicks & I think she was young & yet still more reliable... I've got 6 chicks in the kitchen that are 2 wks. old & i could probably let them go out for a few hours every day now except I wouldn't put them out on rainy days etc. But I feel a little sorry for them because the hen has had her chicks out since they were just a day & 1/2 old & when they need warmth or protection she's just there like a portable brooder.... Because it was her first time (& mine) I only put her on 3 or 4 eggs & now she's got 3 chicks (the last one she'd left & I put under another hen that's broody) anyway if I'd had know she was as good at this as she is I would have given her more...
And it was said in one of the incubator threads, its natural for them to hatch into a dark warm safe place under mummy hen, not into a big bright incubator with wire under their feet.
What would you rather, to be raised with your parents, or the be stuck in a both where you had warmth and shelter but no mother. Think Maslow's self-affirmation triangle.
That being said though, Mama hen can only do so much, shes not a machine, and most importantly, she isn't going to let you anywhere near her babies unless she wants you there. Bonding could be ... problematic.