Web Browsers Reject About Two Thirds of Cookies

"Cookies were originally designed to track users across the web on browsers."

No. Cookies were originally designed to temporarily store state information.[1] I would be astonished if any of the designers envisioned in 1997 the persistent cross-site tracking that has become "normal" in the late 2010s.

[1] See RFC 2109: https://www.ietf.org/rfc/rfc2109.txt