Dear happy to be free,
You make a very good point about we should rely on Jehovah.
But please take note depending on the language you speak and the nationality you are, waiting on Jehovah may not mean being presumptious at all but could also convey reliance on Jehovah.
But all points taken it is extremely important as you have said to completely rely on Jehovah God free from presumptiousness that we know better.
PS- Please keep in mind that Jehovah God past and present Has used faithful slaves to carry out His will.