I believe that the lack of an angled deck is related to the plane of choice. The F35B is the STOVL variant, and they intend to take off via the ramp, and land vertically on the tail.
The angled deck is intended to allow simultaneous takeoff and landing operations, so that if a plane which is landing has a problem/has to abort, the angled landing trajectory will carry it away from the planes which are taking off from the forward part of the (straight) deck.
Due to STOVL, this shouldn’t be necessary, as planes which are landing vertically will not be carrying enough velocity to require the angled deck. Or arrestor cables for that matter.
Just a thought...
Probably right. Is the F-35 VTOL ?