The problem with SCOTUS going after these laws is that they are a matter of practicality. If an attack is launched on the USA, the military and the President aren't going to sit back and let it happen, they will act.
When the constitution was drafted, time delays necessitated that the military and the President act autonomously for the most part. Congress couldn't convene rapidly enough to expect them to have much say in all but the largest and most drawn out conflicts.
The War Powers Act is codifying this implicit power. The framers never considered a situation where the President and Congress is watching a conflict play out across the world in real-time and making decisions. So it's literally impossible to say how they wanted this to be handled. That's why they gave Congress the powers to write laws.
And yet, now here we are in the 21st century, where it feels like we're on the opposite side of the time delay problem. Instead of the War Powers Act, what if we allowed congresspeople to use PEKs to vote by proxy in the case of an emergency (definition needed)? Surely that would be better than creating a all-but-in-title king out of the executive branch as concerns conflict?
The security issues around that are similar to the issues with electronic voting and have been covered exhaustively. You're creating the absolutely juiciest target for hacks and espionage. I would say they could meet by remote teleconference but that has issues now too with deep fakes getting better and better.
On a similar note the communication time has vastly narrowed but so has the ability to perform attacks.
When the constitution was drafted, time delays necessitated that the military and the President act autonomously for the most part. Congress couldn't convene rapidly enough to expect them to have much say in all but the largest and most drawn out conflicts.
The War Powers Act is codifying this implicit power. The framers never considered a situation where the President and Congress is watching a conflict play out across the world in real-time and making decisions. So it's literally impossible to say how they wanted this to be handled. That's why they gave Congress the powers to write laws.