‘O Allah, forgive me if You will; O Allah, have mercy on me if You will.’ Rather, let him be firm in his request, for no one can compel Allah.” Other examples include deliberately using rhymed prose in supplication, gasping, speaking affectedly, and similar practices.
These supplications and others like them are prohibited. Some supplications are permissible, such as asking for nonessential things that involve no sin.
The point is that contentment on the path to Allah does not entail abandoning anything obligatory or recommended. Thus, abandoning an obligatory or recommended supplication is not an expression of contentment, just as abandoning any other obligation is not part of religiously prescribed contentment, nor is committing prohibited acts.