The cause and effect of tax breaks causing company migration isn't clearly established. Further, you'd need to consider what the city's tax revenues would have

The cause and effect of tax breaks causing company migration isn't clearly established. Further, you'd need to consider what the city's tax revenues would have looked like without those companies HQ being located there. Finally, (and this, to me is the least interesting argument, but people from SF seem to love it): is the gentrification that ensued universally "good"?