You are making total sense 
but Writing a good feature request says
and we just try to apply this principle. For a development team, each effect is a piece of work. We can have a general discussion about the need to stereo-rize the synths, that’s fine and probably a good discussion to have. But if we are talking about Wishlist wishes and votes, then we need to follow that guideline. The Polyend team doesn’t want to sign up to vague/broad wishes, and that is understandable.
For what is worth, I fully agree with this wish! In fact yesterday I started to think about using the 3 synth slots and the 8 voices with different panning and micromoved notes to recreate a poor person’s phaser or chorus. It was late and I didn’t want to start tired. But yeah, only yesterday I realized that panning can be done only at the synth slot level (three options) not at the step level as in audio samples, which would have allowed to more stereo-like possibilities.