It may look like it is, but it is not working as expected / synth doesn't handle it correctly.
For example,
1. Massive - when the phase is set it starts to click on attack, probably due to improper handling of zero crossing.
2. Tal mod when turning the phase button it crackles, distracting from the goal.
3. Vital doesn't restart the phase on legato.
Haven't tried Zebra because of the outdated sound.
Pigments got phase control only in version 5, and this is only for wavetable engine, it also has custom curves.
Phase plant is another contender.