Home business deductions

I have two questions related to home business deductions:

1. Mortgage Interest.  TT is saying to check a box "yes, include for this home office deduction".  Why would anybody ever not check it?

 

2. I am not itemizing deductions because I am SALT limited.  I'm taking the standard deduction.  It says, "if you paid real estate taxes but are not itemizing deductions, enter the taxes you paid here."  I'm assuming "the taxes you paid" are the full amount I paid?  If not, what should I enter? Also, surely it knows I'm not itemizing deductions so why even ask?

 

Thanks for the help (ChatGPT was clueless)!