I'm asking the very same questions about the UK's F-35B purchase. The logical point of having new 280m long carries is to not require STOVL. Just fit a catapult and buy an F-35C, or even better a Rafale M.
That's the problem. It's all become about ego over capability.
Making a non-carrier Typhoon was the world's stupidest screw-up. The second most stupid screw-up was not fitting a catapult to the new carriers. Third most stupid screw-up was signing up for an overly complicated STOVL stealth fighter, that can't carry stand-off weapons internally (therefore no stealth advantage), can't dog-fight and has no gun and no range. At least the C variant would only have 2 of those disadvantages.
The Rafale M? Sure, it's less stealthy, but has better range, can dogfight and has a gun. So it has maybe it has a lower RCS, but wit closing speeds of over 1km/s, IRST, the R^4 term in the radar equation and MRAAM success rate, I'm not going to bet on a small stealth advantage as a plug for all holes. Buy a Rafale M and invest the spare cash in radar technology, ECM and EW.