It seems the water dousing after the methane fire after landing…
https://www.teslarati.com/spacex-fir...rship-retired/
The day after Starship SN15 was reinstalled on a launch mount, giving SpaceX unrestricted access to its aft, all three of the rocket’s flight-proven Raptor engines – the first of their kind to survive the flight profile intact – were removed…..
To a degree, especially if SN15’s flight-proven Raptor engines were rendered unusable – as they appear to have been – by exposure to water immediately after touchdown, “reusing” the Starship would be more symbolic than anything.
With a thorough inspection, it would be easy enough to determine that the Starship’s structures and mechanical/hydraulic systems would be up for a second launch, but the slow ~10 km (6.2 mi) flight profile ships SN8 through SN11 and SN15 completed was already only relevant for testing Starship’s exotic, unproven method of landing.
In that sense, another fully successful ~10-km launch and landing would only benefit Starship development insofar as it would increase confidence in the landing profile by proving that the first success wasn’t a fluke – however incredibly unlikely that might be.
Of note, SpaceX also has not plans to recover the first space-proven Starship, instead (nominally) performing a soft-landing in the Pacific Ocean if the prototype makes it through its inaugural spaceflight without issue.
If that “Orbital Test Flight” is a perfect success, SpaceX will likely have enough confidence – and regulators enough data – to proceed to the first attempt to recover an orbital Starship on land.
In the meantime, with orbital launch site buildup now moving at a breakneck pace and tens of millions of dollars of custom pad hardware, giant cranes, and months of work sitting a few hundred feet away from the landing pad, attempting to push the envelope with SN15 likely just isn’t worth the risk…..