Using XOR to derive a data key for ECIES
As written, it makes an additional security assumption on the symmetric cipher; that the attacker can't flip bits in the key (and modify the ciphertext) to gain some advantage.  That is likely true for most ciphers we would use in practice, but is nevertheless an additional assumption.
This is not difficult to fix; we don't select a random symmetric key $K_d$, instead, we generate a random value $J$, and set $K_d = \text{Hash}(J)$.  Then, in step 4.2, we then instead set $A_i = K_i \oplus J$.