The 16 inch requires macOS Catalina, which kills all 32-bit apps, among other things.
My employer still has some critical apps we use that are 32-bit, and while I wouldn’t be buying a 16 inch MacBook Pro for work, I don’t want to be forced to use Catalina at home. At least, not yet.
Maybe in six months. Or maybe not. But by then, it may be too late and many people may have moved on to other machines. I know I probably will have done so by then.
Why? Apple will replace it with a new one in WWDC 2020. Don't waste your money on a 2019 MacBook.