“Isness” definitely doesn’t need to be transitive.
It can be used to give properties to a subject. An apple is crisp, red, and 100g. Crisp isn’t red, red isn’t 100g, and 100g isn’t crisp.
It can also be used to specify a general case. Honeycrisp is an apple. Golden Delicious is an apple. Fuji is an apple. All three of Honeycrisp, Fuji and Golden Delicious are distinct.
“Isness” definitely doesn’t need to be transitive.
It can be used to give properties to a subject. An apple is crisp, red, and 100g. Crisp isn’t red, red isn’t 100g, and 100g isn’t crisp.
It can also be used to specify a general case. Honeycrisp is an apple. Golden Delicious is an apple. Fuji is an apple. All three of Honeycrisp, Fuji and Golden Delicious are distinct.