Incredibly simple appearance, in comparison to an F1 car. Wonder if he missed F1 yet? ... even if he suggests otherwise to the media??
Good Luck Alonso!!
Part of the simplicity is that at Indy (and most ovals) cornering speed isn't as important as straightaway speed. An F1 configured to run at Indy (oval) would look stripped down too.
When Indycars race at road/street tracks, they do have more aero bits. Still nothing like an F1 car, but much more complicated than the one and done chassis McLaren is sending to the 500.
I'm not sure if Alonso is missing F1 or not. It's a ton of pressure, and without the ability to deliver meaningful results, it must've been very hard on him. Indy is something he can win, so I would imagine he's happy to do that instead of hope for a miracle at Monaco.