Cf David Chart's post in the WC errataed errata thread.
Even going with the first errata, this just makes things a little harder, not impossible. It also has an added side benefit: It makes Mercurian Magic all the more worthwhile, since only a group of mercurian can hope to cast a powerful aegis efficiently and without using up too much vis, which fits the setting nicely (even if I prefer the errataed errata)
Claiming wards must penetrate utterly contradicts the spell's mechanical description regarding beings with Might.
But there's worse:
Claiming Pilum of Fire must penetrate utterly contradicts the spell's mechanical description, period (It says it burns the target, and that's all. No mention at all of resistance, right? Thus it doesn't need to penetrate)
Claiming the Shrouded Glen (a D: Year, T: Bound spell) must penetrate utterly contradicts the spell's mechanical description.
Need I continue?
All spells are worded as if they succeeded in penetrating MR, without mentionning this requisite. Arguing that this means a specific spell doesn't need to penetrate is 