Shield block says that it's triggered when you take damage, so the damage is already rolled. Yes, it's kinda gamey, but you know how much damage is incoming and can make the decision on whether to block or not based on that.
Ok thank you, understood. That makes the rule even more stupid than before...
does that mean before or after actually rolling the damage?
I don't think there is a mechanical issue with Wizards (or any other spellcaster really) wearing heavy armor... because armor is a death-trap. Armor has no impact at all on your potential AC (if you're properly built); rather the heavier your armor, the worse your TAC, Speed, and Checks. The worst part is the Wizard is paying a dedication feat for the 'privilage' of suffering those penalties. At least Fighters and Paladins are getting greater proficiency ranks to compensate (ineffectively)
Agreed on the heavy armor bashing, but it is no problem for a wizard to get to 18 Dex in lvl 5 and wear a nice breastplate. Can’ he also take a shield when multi classing fighter in lvl 2? There is no check wizard usually do (athletics or acrobatics) that can’t be worked around with spells, and mobility isn’t an issue for elves or half elves. Dexterity is a good stat for wizards anyway so why not wear medium armor? And to be honest who cares about expert, master, and legend compared to proficiency rising per lvl?
There is another possibility, they played it wrong. In my opinion they did not know their own rules, because the totally ignored the hardness of the shield. The shield should have absorbed 5 damage and the character should have received 4 damage as explained. The shield should not have received a dent, because of its hardness of five it should take 10 damage for it to receive a dent, and 15 damage to get broken instantly.
It is really simple.
You are right about the wording. The problem is, if you apply shield block after roling for damage you can prevent the shield from getting a dent, simply by not using block when the damage is higher or equal to the shields hardness. This can not be intended. As always I recommend to use rules “as intended” and not by the book.