It's most probably UBI's hand that made this so... where as DCS looks independent of such interferences.
IL2 raised the bar wrt prop sims in 2000.. DCS, AFAIK, was nowhere to be seen. DCS is the next step.. but like everything wrt to games/sims.. DCS started out as a modern day sim, now trying to tap the WW2 market.
If they're wise (including yours truly) I'd look at the last best WW2 sim and learn the lessons.. instead of sticking my head in the sand.
:-)