The court isn't complacent, the conservative justices know exactly what they're doing. They are operating under the belief that once a president from the other party gets elected again, they will still have the old rules to fall back on.
But the ultimate truth of power is that the bounds are whatever you can get away with. Both the republicans in congress and the supreme court are burning every shred of legitimacy they have left in letting Trump get away with his crimes. I am certain the standard will suddenly change when a democrat gets elected again, but the court has set itself up for a perfect "now let him enforce it" moment.
Student loan forgiveness gets blocked by the courts but the administration is allowed to block funds allocated by congress with no push back? Well, that's the new standard. I certainly won't complain much if the next democrat in office starts doing the same thing. If the republicans didn't want the president to have that power, they should do something about it.