The problem isn't economists or economic data, it's managerial bureaucrats/elitists who think that data makes them gods who can control society through trying to manipulate such things.
To be fair, some economists fall into the category, but the root problem is not people of that specific profession, it's people with a god complex in general.
Every damned economist bitches about some imaginary number going up or down, without giving a shit about what matters to the average person.
If a nation has 1000 bricks production a year, but 1000 people, it's realistically 'poorer' than the nation with only 100 bricks but 20 people.
The real problem here is that managerial elites have a perverse incentive to want the organization they are managing to grow in size. The bigger organization, the more need for managers, the more need for managers, the more management jobs open up, the more management jobs, the more jobs for managers of managers, and that means promotions for the manager and for his buddies for they were already there and so have experience and seniority.
The other motivation is cheeky financial policy. National debt is for one, and the lower it appears, the more money they can borrow to spend on own pet stuff.
Say, you have a country of 1m people with 100k gdp per capita. Like many western countries it has 100% debt to GDP ratio, aka it has 100bn debt, or 100k debt per capita.
Let's say in our example country treasonous bureaucrats win elections and institute open borders policy. They let in 100k of third world refugees who will average make barely 20k per capita, to "grow the economy" despite lowering the country's per capita GDP.
Now the GDP per capita is 91k, but a miracle has happened in some of the important financial benchmarks...
GDP has increased by 2% to 102bn, so yay, the useless bureaucrats have hidden the fact that they couldn't make the economy grow naturally, many finance people are happy that line went up, while debt to GDP ratio fell to 98% (so they can borrow about 2bn while staying at 100%, don't ask where that 2bn will go), and debt per capita fell to whooping 91k.
It's crazy, but for those who only look at the math it adds up. And in some scenarios law and regulations even forbid people from considering anything other than specific statistical indicator values.
Please ignore the fact that no one wants to live in the homeland of the people who came where they made 10k per capita but have a huge economy because there's 100m of them, by common sense, and from the position of average citizen GDP per capita is much more relevant than size of economy, but for people at the very top can be quite different as i've shown here.