No, no - that is for badly written not written characters that switch sides like Italy during WWII.

The S(h)ith had longevity, life through force (my headcanon to make for a better world building is also that Sidious was actively keeping Anal Kin alive through force, thats why the roasted wiener guy deaded immediately after the static-electricity challenged teacher “did”).

But it’s not all fun & cookies - sith also had to suffer the insufferable Darth Cleanex