You've not made a case for anything. All you've done is reject the reason and declare it good.
I did not make the claim that the shield spell is broken. Others did say that specifically:
It's either a good spell on a wizard or broken on a high AC fighter/wizard/EK combo.
It is literally the discussion of the thread. After reading the thread accepted this premise that it is broken. I do not. So I asked for an example.
You can get AC 26 multiple times per day. That is broken if you know even a little bit of the math involved in 5e.
You left out the part that it is until the start of your next turn (which, according to the
math, most likely will not even be one round). So a player loses an entire level in their paladinhood, gains a hypothetical 26 AC (min/maxed to the core) for one or two attacks that don't involve spell saves, and that breaks the game? Again, show me where, in any online play, or in any case scenario, this has broken the combat for a DM to challenge their table?
If you are going to complain that things are not fair to the other players that don't get that, then please do that in your argument rather than scapegoating it to breaking the game's combat mechanics.
Shield cheaply and dramatically reduces the core vulnerability that wizards have to compensate for their absurd levels of power and versatility, and trivializes a round of defense against weapon/natural attacks, especially when combined with any other defenses.
I get the versatility argument against the wizard. I really do. But a fourth level wizard gets to cast this spell four times per long rest, providing they cast no other first level spells. Most of the time, depending on initiative, it won't even last a full round. That's four rounds this wizard gets to boost their AC, at the detriment of limiting this versatility, their damage output, and their choices. And none of this accounts for the times when a +5 doesn't stop the attack! I have still yet to see a well-rounded fourth level wizard have enough hit points to be able to take more than two shots from a common CR5 creature. (Which they encounter all the time.) So they stop an attack or two, how does that break the game's combat mechanics?
Again, I am asking for examples, not a mere knee-jerk reaction to either A) character envy or B) speculation.