Ok yes I'm really liking the very detailed explanations in the TPS62933 datasheet.
"For this example design, two TDK CGA5L1X7R1H106K160AC (10-μF, 50-V, 1206, X7R) capacitors have been selected. The effective capacitance under input voltage of 24 V for each one is 3.45 μF”
Oh yes, de-rating of Class 2 MLCCs is extremely important because they lose SO MUCH capacity when DC biased.