not necessarily. I am not sure if you are aware that, in photonic waveguides, unlike the weak waveguide, the polarization is not purely TE or TM, as it has at least the non-zero axial field component. The concept of TE/TM has been eveloved.
Please visit this link for TE Fraction https://optics.ansys.com/hc/en-us/articles/360034396734-FDE-solver-analysis-Mode-List-and-Deck
In general, people do not use TE fraction to design a waveguide, in most cases.
Of course, if your goal is to design a waveguide that requires 100% TE fraction, you can do so. But it might not be exactly 100% as you can check the other transversal component, which in many cases is non-zero.
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