What is different is that Logheads in the Gulf were vulnerable to begin with and then with facilities damaged or under threat lessens their effectiveness. To reach these logheads, supplies must flow through the SOH. In peacetime that works great, in conflict it does not. So that part of the infrastructure is now limited at best and the supplies must flow in from farther afar. Add more ships to the region and you further stress a stressed network. With limited capacity/capability logistics will be prioritized. Not everything will get pushed. What may have worked 6 months ago is likely no longer adequate.

Some pre-position ships carry ammo, but they most be offloaded in a SPOD - sea port of debarkation for further transfer (FFT) or for RN speakers for onwards transfer (FOT) to delivery ships.

As a counterpoint, if you look at Desert Shield, the amount of sealift/logistics ships was staggering. But that operation was deliberate much better planned. SECDEF was Dick Cheney.