This is all true, but I'm rather curious to see how well the attitude will weather the first major public miscast. Mathilde had her daemon run in, but that was confined to her lab. If Hubert goes for a fly some day and explodes into a lightning storm in the middle of a group of winter wolves or some new journeymanling gets overconfident and bursts into daemons in the middle of town, it could be rough.
I think the danger of miscasts is somewhat overstated
Don't get me wrong, it's a genuine occupational hazard, this kid
is going to miscast at some point
But the severity of miscasting isn't as big a deal as it's often made out to be
Like for Hubert messing up a spell because he bit his tongue on a syllable isn't going to cause him to explode like poor Jori unless he's channeling extreme amounts of Azyr
Which he won't be, because none of his spells need that kind of juice
Similarly Wizards don't just spontaneously explode into Daemons the second they slip up
Because slipping up happens all the time
Arcane Marks are a product of miscasts, virtually every single Wizard leaves apprenticeship with one, and will continue to accrue them if they keep growing their magic potential, and this is seen as a
feature and not a bug
Altdorf would be crawling with Pink Horrors if that were a real risk
If the average Jade Wizard really risked blowing a hole into the Aether every single time they cast a spell to cure crop blight or increase soil fertility then their job prospects would look pretty different, and Mathilde wouldn't casually be considering stuff like hiring some Journeymen looking for easy work to go to her fief and poke the sheep for a few years
The vast majority of miscasts as presented appear relatively minor
Stuff like, "My hand has cramped itself into a claw for a few hours and it really hurts" or "I've got a migraine and could use a lie down"
When miscasts are really bad, stuff like "I've summoned an apparition" or "Every orifice on my face has sealed over" or "I think I gave myself an internal hemorrhage", it's generally been presented as a result of the Wizard doing something they should not have been doing
Which means they're highly preventable
Like when Mathilde told Regimand about the Wisdom's Asp the response wasn't "Ah yes, being hunted by an apparition, a common Wizarding experience"
It was "What foolish nonsense have you been getting up to for that to have happened?!"
Really bad miscasts happen because you tried to grasp way more magic than you're capable of handling
Or because you tried casting in really unstable circumstances
Or at worst, it was a cascading failure where something went wrong and then your attempt to fix it made it worse
And even then we don't really get into "you've exploded" territory until Battlemagic
And I have my suspicions that spontaneously exploding or punching holes in reality isn't a regular risk but rather more the "unstable circumstances and/or cascading failure" kind of miscast