In celebrating the exodus from Mitzrayim we need to eat poor bread, made with only bread and water that is devoid of any flavor and not Matzah Ashirah rich bread with flavor. This is because through the exodus from Egypt, we were transformed from being servants of Pharaoh to being avdei hashem, the servants of Hashem.
As servants of HaShem, we should not mix our own pleasure, into our avodas HaShem. Rather, we should accept HaShem’s yoke completely and make His pleasure our pleasure.
(הגדה עם לקוטי טעמים ומנהגים חלק א עמ’ קעה)