Does Hybrid ECS provides performance benefit?

I was just looking around as to does Hybrid ECS provides any performance benefits?

Is it that pure ECS only gives you performance PLUS and hybrid is just to LEARN the data structured programming?

if(answer.isGood)
{
    Debug.Log("THANK YOU!");
}

From what I get so far, the best way to go right now with ECS is to use it when your project’s performance suffers from a lot of instantiations or a massive amount of GameObjects in your scene.

To be honest, I thought about switching my coding to ECS entirely, but I highly doubt the project will be maintenable by unskilled programmers if they get their hands on it by some means.