Why is my old phone still listed on my iCloud account?
Solution 1:
There are two places you can remove your phone:
Find My (iPhone): Removing it here removes Activation Lock and tracking capabilities
Apple ID Devices List: Removing it here removes it as an authorized device to login to your account. If you wipe the device, you still have to re-authorize it so it has minimal impact.
You did not miss a step or expose yourself to a security risk if you wiped it and removed it from Find My. You can safely remove it from any other lists you find it on going forward.