Why Use Electronic Filing?

I have used TurboTax for years.  At the suggestion of TT I always file using standard deductions and I always file electronically.  However, in 2017 and again this year, the Internal Revenue contacts me and asks for all my proof (W-2's, Social Security benefits, etc.).  They say they don't have a way of checking all this.  I know they get the same stuff I do, so I don't know if they're really looking.  Anyway, should I forget electronic filing and just mail my returns in?