Inclusive zoning (the X% of a building must be affordable) is good because it's important to mix different economic classes in the same area. It makes the poor people richer and it makes commutes shorter.

When it gets high it's not a giveaway to developers. It's actually a backdoor way to ban housing construction; NIMBYs love to claim they want "real affordable housing" and then set the IZ requirement so high nobody can afford to actually create any.