Here are a few abilities that are exclusive to the US President:

Command of the armed forces: The President is the Commander-in-Chief of the US military. If they are incapacitated, command would temporarily transfer to the Vice President.

Diplomatic powers: The President has the power to negotiate treaties with foreign nations. In the case of incapacitation, this power would transfer to the Secretary of State.

Appointment powers: The President has the power to appoint ambassadors, judges, and other officials. If incapacitated, these powers would likely be delegated to a senior advisor or Cabinet member.

Pardons: The President has the power to grant pardons and clemency. This power would likely transfer to the Vice President in the case of incapacitation.

The President has the sole authority to authorize the launch of nuclear weapons, one of the most serious and unique powers of the office. In the event of incapacitation, the Vice President would assume the role of Acting President and would gain the authority to authorize a nuclear launch if necessary. This transfer of power is meant to ensure that the United States always has a decision-maker in place who is capable of responding to a nuclear threat.

Emergency Powers: The President has the ability to declare a state of emergency and take certain actions to address it. In the event of incapacitation, the Vice President would assume this authority.

Intelligence Briefings: The President receives daily intelligence briefings on national security matters. If incapacitated, the Vice President would receive these briefings and have the authority to act on the information.

National Security: The President has the authority to make decisions about national security matters, such as authorizing military action or deploying troops. In case of incapacitation, the Vice President would assume this responsibility.

The question with Trump is, CAN WE GIVE THAT MAN THE POWER TO DO THESE THINGS?

The question with Biden is, SINCE HE APPEARS INCAPABLE OF DOING THESE THINGS, WHO IS DOING THEM?