There is more than enough capacity to ship aid through ground routes in Israel.
The Biden Administration seems to want to circumvent Israeli scrutiny of the aid delivery process. They are probably setting up a plan to evacuate Hamas fighters from the Gaza via the US opened sea route so the terrorists can exit the region without Israeli involvement.
This suggests that a Biden Admin US brokered and enabled evacuation of the remaining Hamas leadership and terrorists is in the works
A politically perfect plan - Israel is happy because Hamas is gone and Biden is happy because the Hamas loving Democrat base will be mollified and the swing state of Michigan will be secured - possibly by the added votes of the new arrival Hamas terrorists in Dearborn. .
Particularly since they've reopened the Kerem Shalom crossing and are building a new one to central Gaza. The problem seems to be distribution of aid once it crosses. I think only Israel can protect the aid and distribution points, and Hamas can simply take the aid from individuals when they leave and sell it on the black market. Humanitarian groups, no UN as they're combatants, still need protection. The "port" won't be any different, though I understand Israel will be providing the land based security.
Until Hamas is destroyed, there's no way of providing aid to those who need it.