I guess I mainly think it produces worse societies that are worse to live in, without correspondingly incentivizing innovation appreciably. I've lived in both the US and Scandinavia, and the US feels barely teetering on the edge of "advanced first-world country" in comparison: poor infrastructure, bureaucratic healthcare that causes angst when switching jobs, large numbers of homeless people, huge prison systems, swathes of poverty-stricken ghettoes, visible class demarcations, etc., etc. It felt like such a weird place after I'd spent a few years away and went back, and I realized how it just didn't seem like a nice place to live, but I never realized it could be better than that (I had previously only compared the U.S. to clearly worse-off countries, like Mexico or India). Not just that I thought it was unethical that there were so many poorer people (which I did), but that it was also worse
for me, as a middle-class professional, because of the existence of all these social problems. I guess I could've retreated to a gated community and attempted to create my own bubble, but I've had enough of the suburbs.
And I don't think you have to give up business or innovation to get it. If your Scandinavian startup becomes the next Mojang, you're still going to be fabulously wealthy, so I don't feel at all disincentivized by the distant possibility that I'll have to fork over a percentage of my hypothetical future millions (I'm certainly not going to move back to Texas just for that). There are more successful companies per capita than you'd expect (certainly more than most American states), and the economy generally still runs on a market basis, there's just a little more sharing of the wealth.