but did you still know you can use electrum to achieve high level of privacy? Just make use of coin control, coin freeze, address freeze and many other features in a way you can have high level of privacy
Is there just one way to achieve absolute privacy, I did not also mention absolute privacy, I only mention high level of privacy. Also I made mention of wasabi wallet that CoinJoins and also Mixers to achieve high level of privacy while in addition using coin control which can still help while maintaining privacy.
With reference to the above, UTXO selection only works to segregate your identity. It helps the user to maintain multiple identities but it also makes it easy for someone to track a user through its individual identities and make connections using one way or another. This provides at most a mediocre privacy improvement and is by no means a high level of privacy.