Use of insecure cipher mode such as
ECB is not recommended for use in cryptographic protocols at all.
In case of
ECB, it encrypts identical plaintext blocks into identical ciphertext blocks; and does not hide data patterns well. In some senses, it doesn't provide serious message confidentiality.
Read more about different cipher modes here -- https://cryptography.io/en/latest/hazmat/primitives/symmetric-encryption/#module-cryptography.hazmat.primitives.ciphers.modes