Removed: nothing. The admin tool was reachable from standing employee accounts, with no time-boxed elevation in front of it.
Outcome: a socially engineered employee account was enough to reach the internal admin tool.
The 2020 Twitter hack occurred because attackers socially engineered Twitter employees to gain access to an internal admin tool. If JIT access had been enforced, the compromised accounts would have had limited capabilities.
Source: Vice, reporting on the 2020 Twitter insider access hack (15 July 2020)