I believe Lacerte does provide similar info with the 'analysis' tab.   Perhaps a case of 'you get what you pay for'; Lacerte does have more bells & whistles than PTO.  That's shy Lacerte costs more.

My m.o. is similar to Phoebe's.   I reconcile the entire return, then do *what if's* with retirement contributions. 

Changing AGI by funding retirement (IRA or otherwise...) impacts many computations for more complicated returns.  So the programing wouldn't be 'that' simple.