IMO, as Utopian so aptly covered, it's all about experimenting with stone to steel effect and affect.
I can now get most any razor (Old wedges excluded still) to a shaveable edge with the assortment I have.
But as I get different steels, I do like to trial on different stones. So ark's, coti's, thuri's (still needed), and synth's all have a place, and a time in my shop.
So, to me, this is a chronic disease, if a disease it is. There is no cure, cept time.
Cheers.