If I become biased or incompetent at my job I’m eventually get fired but do judges ever?
Each Executive administration since W has reached further and further. Congress has ceded more and more, because while it is their responsibility to choose, doing so comes at a political cost they don't want to pay. So they hand it over to the Executive.
Time for some garbage collection in the law code. If you want a limited Executive, vote for a Congress that will take its power back. The Constitution gave tariff power to Congress, for example, and a few decades ago, they gave it over to the President. IIRC, the same goes for border policy and deportation rules. We keep assuming when we install all of this machinery in the Oval Office that no... no he wouldn't push that button, it would be indecent. Every President pushes more of the buttons at their disposal (with the possible exception of Joe, as it was his staff running things and not him), and this one is no exception.
its all just some text on a poece of paper, and neither congress nor the executive wield the military, so their opinions are irrelevant.
So either a judge can block orders that exceed the president's authority and orders that are within it, or the judge can block neither.
Bear in mind that this was a case where the multiple courts who considered the issue were unanimous in their opinion that the President was very likely to lose on the merits. Exactly the kind of case where there should be an injunction.
Since when did we start arguing that executive power must be unchecked for fear of it being slightly inconvenienced?
Not at all. Whether or not the president is exceeding their authority, a judge could block it nationally. It's not like lower court rulings haven't been overturned before.
And the bigger issue is "judge shopping". Want to block something nationally? Just find 1 of 700 judges who will rule the way you want, and file in that district.
It would be more accurate to say that prior to this ruling, any of 700 district judges could unilaterally block the president from exceeding his authority under the constitution pending a review, including matters of national security, based on their own subjective view of the law. It may differ in other countries, but under the US Constitution, the judicial branch ultimately decides the limits of executive authority, not the President.
If it's truly a matter of national security, the President could always file emergency appeal and it would almost certainly be granted. If it's such a dire and immediate emergency that even those few hours were critical, it's doubtful that any President would feel obligated to obey the injunction anyway.
Far from preventing the proper functioning of government, this was one of the few remaining guardrails maintaining the proper functioning of government under unprecedented circumstances.