I've heard Hobbes' interpretation of Attribute Boost over the years but I've never played that way. Here's the rule from p.309 of
SR5:
When you activate this power, make a Magic + Attribute
Boost Rating Test. Each hit on this test boosts
your attribute rating by 1, up to your augmented Attribute
maximum. This only affects your dice pools; your
Physical limit and Initiative ratings don’t change with
Attribute Boost.
The rule says that the attribute rating is boosted by 1 per hit, but then walks it back by saying that only dice pools are affected, not Physical limit or Initiative.
There are several things which fall in the cracks and aren't explicitly addressed, like carrying capacity, movement rate, condition monitors, recoil compensation, and melee damage.
It seems to me that the GM has a reasonable choice of whether the "boosts your attribute rating by 1" statement takes precedent over "only affects your dice pools", or vice versa. Is there an official ruling that adopts the latter interpretation? If not, is there a reason people use it? Do they find the power unbalanced otherwise, or is it too much work to track all the downstream implications of fluctuating physical attributes?