Well - I think, if I had to really think hard, that Tony has no idea what to do if he's not building weapons. So the arc reactor - using it to power his heart out of necessity, sure, that's easy - but coming up with a workable plan for supplying clean energy on a large scale - not really up his alley.
Plus, he's a bit obsessive. This ties in with the whole beginnings of PTSD, because he can't actually concentrate on anything but the suit and the mission. He just can't do it. Especially after Gulmira, and I can see this just getting worse after Obie.
Immediately paranoid: well, he didn't exactly get embraced with open arms after the press conference. Rhodey reacted badly, Obie definitely wasn't too happy, despite pretending. Even Pepper was taken aback.
Plus - back to the PTSD - he had to keep what he was doing secret from the Ten Rings for months. It's only natural that that mindset stick with him when he gets back. Keeping secrets kept him alive in Afghanistan.
Re: TONY STARKS WON THE OSCAR, Y'ALL.
Plus, he's a bit obsessive. This ties in with the whole beginnings of PTSD, because he can't actually concentrate on anything but the suit and the mission. He just can't do it. Especially after Gulmira, and I can see this just getting worse after Obie.
Immediately paranoid: well, he didn't exactly get embraced with open arms after the press conference. Rhodey reacted badly, Obie definitely wasn't too happy, despite pretending. Even Pepper was taken aback.
Plus - back to the PTSD - he had to keep what he was doing secret from the Ten Rings for months. It's only natural that that mindset stick with him when he gets back. Keeping secrets kept him alive in Afghanistan.