It is entirely possible to create a mage type character without bob or str (without str is rather common, bob less so), and therefore gain a small bonus to your mage spells (visible mostly through shield/armour, as they are the only things you see -- albeit 'soft' -- numbers for). But you have to ask yourself: What is the cost? The loss of str spell and bob (mostly bob) would render most mage characters unplayable simply because they do traditionally have rather bad moves. The example you mention, creating a character which has better moves and strength without bob or str is absolutely possible, but it wouldn't be significantly better than a character with those capabilities. Perhaps the greatest gain would be the ability to use those pracs in another area -- you could prac charm and a reasonable amount of command with those pracs. I would say that in most situations, a character which has the ability to bob, even with the cost of having worse moves and strength, is rather more versatile and capable than one which cannot -- even if it has slightly better moves.
In the end, the difference between said bobbing char and non-bobbing char's moves and move regen will be very small compared to the rather large loss of BoB, and strength spell to a lesser degree. Even if you spent those pracs in only endurance, or mostly endurance and some parry, you would still have significantly less ability to sustain constant motion than the char with bob -- Not to mention completely destroying your ideal of keeping the mage as pure as possible (see aforementioned thread on cross-class pracs).
So really, although it's possible, it wouldn't be worth it. IMO anyway, and I doubt many people will disagree on that particular point
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