Is the phrase "If there were blessing in increasing it, Allah would have increased it in His Book," which a Sharia doctor said when marrying off his daughter, refusing to increase the dowry, permissible?

The Sharia (definition) encourages making the dowry light and considers its smallness an indication of the marriage's blessing and the wife's auspiciousness, based on the Prophet's (peace be upon him) saying: "The most blessed of women are those with the lightest burdens." If Dr. [name] intends to encourage making the dowry light and avoiding extravagance, then he is correct.