Earlier quoted context omitted.
GDP going up does not absolutely improve people's quality of life (and there's quite a lot that can make GDP go up while making every participant in the economy miserable.) That's why optimizing for it makes no sense.
More money is strictly better; if you think rich countries are "unpleasant or unpractical" to live in, try living in a poor one. You're right that GDP is far from the only thing that matters. But sacrificing growth for intangible benefits is a tradeoff that should be made very carefully indeed.
Same with economics: wealth is the important part. Wealth can be invariant while money fluctuates.