Is saying: "What if you had done such and such?" or "Why didn't you do such and such?" or "I wish you had done such and such?" or "If I were in your place, I would have done such and such?" to someone who did something, and you thought it would have been better if he had done something else, considered an objection to divine preordainment (qadar)?

Phrases such as "If I had done such and such" or "I wish you had done such and such" vary in their ruling depending on the intention. They imply an objection to divine decree if the speaker believes that had the action occurred, the predetermined outcome would have changed. However, if the intention is merely to inform about something related to a future benefit, then there is no harm in them. The phrases mentioned in the question do not appear to be an objection to divine decree as long as their purpose is to advise the addressed person and guide them towards what will benefit them in the future, and they are not accompanied by a corrupt belief regarding divine decree.