Though I agree with most of your analysis (G likes to push new ideas quite hard, to find a sweeter spot later), this one I just can't agree. Fealty was ignored by any civ with a focus on specialists. But now that it's a reliable source of food, it can be used for those civs with a focus on specialists (coming usually from Tradition) but with the bad luck of not having enough food in their settling lands.
Artistry is still quite potent IF you have enough food (good start, or good pantheon). Its strenght lies in the extra GP generation, mostly, and the extra tourism, which can lead to higher growth bonuses for your trade routes.
In a sense, the excesive synergy between tradition and artistry has been reduced. But artistry still is more benefitial for tall play (there can be only 3 of each guild, great works do better for smaller civs, open borders are given to friendly civs and tall civs have more friends), which is the usual settling pattern for Tradition.
I opened a thread not long ago about widening artistry. Seeing how artistry needs food now, I'd say that a good way to widen this policy tree is making it buff all food buildings. Something like "+1s/+1 c to granaries, aqueducts, grocers, and hospitals". Or "+1 GWAM points to granaries and grocers, +1 GSEM points to aqueducts and hospitals", if it conflicts with the scaler.