Fair enough! As I said, I fully expect people to disagree here and there; reasoned disagreement is, in fact, something I find very useful as it allows me to see things that would otherwise escape me (and if it fails to convince me, hey, I've not really lost anything).
Yes. But barring some very specific characters/situations, each fatiguing spont carries (at least) a 1% risk of a botch.
There's a surprising amount of stuff you can do with first magnitude spells cast daily, that would accrue a mage 3-4 warping points a year if cast with fatiguing spontaneous magic. I know that many troupes handwave stuff that happens off-screen and don't roll for it (e.g. the yearly casting of the Aegis); I feel that is a houserule though.