Even when it’s isolated to the era between The Phantom Menace and The Last Jedi, you can see that the power play between both factions not only caused the Sith and Jedi to duke it out amongst themselves, but they also were crucial to forming the Galactic Empire/First Order and the Rebellion/Resistance.
However, in the case of the Jedi, they kind of turned out to be the more damaging of the two sides.
A continued cycle of dominance between the Jedi and the Sith is the most basic reason for why the universe of Star Wars has been in a state of upheaval for quite some time.
You can’t have one without the other, and both orders live to fight the other to the death.