This answer is not correct. Pairs of electrons occupy a reasonable amount of space and repel each other as well as attached atoms. You must have a hybrid orbital for each atom and for each pair of electrons so that the geometry of the orbitals matches as close as possible the geometry of the attached atoms and electron pairs. If you did not have hybridized orbitals the p orbitals (at 90 degrees to each other) would have very inefficient overlap with the s orbitals of the hydrogen atoms and the resulting chemical bonds would be very weak.