Investors & landlords

I'm still not clear on why I need to manually enter this "QBI Passive Op Loss" number?  Say I had a -$5,000 loss in 2019 but then in 2020 I had income of $2,300... which doesn't erase my carry forward loss from 2019.  Does this mean I would enter -$2,700 as my "loss" for 2020?  Is this the QBI Passive Op Loss for 2020?

If so, why doesn't TurboTax already do this math?