'Must to be' is not a possible structure in English. 'In a way' is not included in the meaning of either 'necessarily' or 'must'.
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bepleased'necessarily' ... "in a way mustSo 'not necessarily' means 'doesn't have to be so', 'doesn't have to be true'.tobe so"
bepleasedFood that looks good doesn't necessarily taste good.It is not logically necessary (required) that food that looks good is food that tastes good.