Safety aside, this is part older news but might explain why the wheelbase increase and a whole lot more. Seems the engineers indeed have their challenge - 'sizeable oversteer on corner entry and understeer on corner exit'.
AUTO RACING - INDYCAR: Dallara Commits To DW12 Updates
Also, to keep this 'qausi' spec series in check, teams are budgeted to $3 mil. and no, please don't compare that to F1 dizzy money.