Other financial discussions

Still not too clear Sir.  I assumed you said that IRA contribution  which is pre-tax  is the deductible and Roth is not.  But why would  someone want to put his non-deductible (after-tax) to his IRA to be constrained by RMD later instead of just putting into a stock investment account without being constrained by RMD? 

I have 457 Deferred Comp which is for government employees and I believed is also considered IRA. You said  IRA contributions are not reported on your W-2.  But in my W2, my 457 contribution is shown in Line 12b with a "G" abbreviation.   Again it is a personal account but it is also set up by my employer but manage by a Financial Company like VOYA.  But you said it is not.  I am getting more confused.