You're literally just repeating yourself.
if what you say were true, you couldn't have a good economy with for instance slavery.
Begging the question. What I say is true, and no, you can not have a good economy with slavery. High GDP? For sure. But good economy? No. Why? Because there isn't a healthy distribution of wealth.
The economy doing well is pretty objective, whether it's distributed properly is not.
Wealth distribution isn't some abstract concept. Plenty of frameworks have been developed to create (or at least attempt to create) a healthy distribution of wealth. The Kuznets curve and Pareto distribution have helped with economic planning across many European countries that don't seem to have nearly the severity of income inequality or living unaffordability as the US.
I don't even see how your last bit is relevant to my comment. Where does welfare fall into my main point that the economy is only doing great if you equate "the economy" to GDP?