The economy is overheating, the "reckless" Trump tax cut threw gasoline on an already strong economy. Our economic infrastructure can't handle the strain of anything over 3%. Anything above that is going to create massive strains in the labor market and inflation and interest rates are going to spike. Therefore it is irresponsible and foolish to attempt to push the economy any higher, as Obama understood (because of course, the reason the economy sucked for eight years was he was growing it slowly and "responsibly").
“heard it on NPR”
None of my business, but why would you listen to NPR?