Does precise planning and reduction of monthly expenses bring about a decrease in blessings, similar to what was narrated about food running out after it was weighed, whereas it had not run out before it was weighed?

There is no objection to a person managing their income and expenses and dividing them, for managing one's livelihood is important to avoid extravagance or falling short in obligatory spending. It has been said: "Perfection lies in three things: chastity in religion, patience in calamities, and good management of livelihood." As for the narration of Aisha, may Allah be pleased with her, concerning the blessing of barley and its disappearance when measured, it is a matter of karamah (a miraculous favor), where the blessing was lost by paying attention to the ordinary and measuring it. Management and economy should be undertaken by resorting to legitimate means, while the heart remains attached to Allah's bounty and blessing, and trusting in what He possesses above trusting in what is in one's hand.