Follow me on this: Magister Tree:
1-Specialist school +3 to DC
2-Augmentation school, added effect upon cast
3-Familiarity with school -15% Cooldowns (can only afford -10% with 24 points maxed out)
4-Master of School +3 to caster level and maximum caster level (essentially useless for a wizard, as even if you wanted to boost evocation it would be simpler and cheaper to Twist the sorc +3 to caster lvl/maximum caster level or +2 to caster level/maximum caster level AND +20% Damage boxes). (cant even afford it, but even if I could it's useless as above)
To get multiple ranks of a higher tier requires the same number of ranks in all the previous tiers I.E. to get master of school to rank 3 requires 3 points in all of familiarity 3 in augmentation and 3 of specialist.
Further, at 24 points per destiny there are simply not enough points to max out master of school anyway without giving up all tier 6 abilities (-10% SP costs or the final +1 int/cha) AND also skipping the spell pen box entirely.
+3 DC's is the most significant box in the magister Tree. It should not be available at tier2 and easily twistable by other classes. Master of school is currently nearly useless as it is a waste of points. Even if there were enough points to reach 3/3 in master of school it is overshadowed by twisting the tier 3-4 sorc boxes
Ironically, until this is fixed the SORC tree is actually better for necro specced wizards: Full sorc tree and +3 DC's +3 Spell Pen and 1 other twist of your choice VS. Full wizard tree and +30% element dmg, +3 spell pen and +20% secondary element
A necro specced wizard using SORC destiny does MORE dmg, while retaining SAME DC's. The only difference is Maybe maybe the -10% SP costs if you can even afford that considering that the best I could do is to get to tier2 (-10% cooldowns) and getting that would require you to skip spell pen box entirely. With 24 points and a maxed out tree, most builds won't even bother picking up the "master of school" for the laughable +1 to caster level.
Edit: Having put more thought into it, I'm not sure that reversing the boxes fixes this problem at all, as everyone else can still simply twist +3 DC's even if it was at tier5 and then wizards would end up foregoing tier6 abilities to max it out in their own tree.
-I think that one way to fix it might be to have Master of school add +3 more to DC's (so magister could potentially reach +6 to DC's vs +3 for everyone else).
Note that FVS can already get +5 to Evocation (Twisting 3 from magister and 2 Evo from draconic incarnation).
-Also remove the prerequisites so that only 1 rank is required in each prerequisited to reach the next one instead of 3 ranks to reach 3 ranks of the next.