There are some kinds of heap isolation worth doing, eg some mentioned in https://www.synacktiv.com/sites/default/files/2022-10/attacking_safari_in_2022_slides.p

There are some kinds of heap isolation worth doing, eg some mentioned in https://www.synacktiv.com/sites/default/files/2022-10/attacking_safari_in_2022_slides.pdf https://www.synacktiv.com/sites/default/files/2022-10/attack.... But the good ones rely on PAC (pointer signing), which comes from CHERI and x86 doesn't have it.