Aroch haShulchan and A Tale of Two Humros

In YD 89:11 AhS seems to accept the premise of the Rema - namely that we wait after Hard Cheese to eat meat, just like we wait after meat in order to eat dairy. Although he does acknowledge that
"Rabbim ein nizharin bezeh.."

However, in YD 89:17 he objects to a gzeira about kashering a keli back and forth from meat to dairy

A it's a humra yeseira
B ein lanu ligzor gzeiros midaateinu

Q: Mah nafshach! Siman 89 has many humros and gzeiros not found in the Talmud! Why pick on this one?

KT
RRW.
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