Advantages of having a CFP (fiduciary) managed portfolio vs. Self directed (all index funds)?

I'm at the point where my institution will assign me a dedicated financial consultant. I have my first meeting with them coming up.

My question is this (I'll ask them the same question): what can they provide for me that I'm not getting from my almost entirely index fund based portfolio?

I've read the FAQ section on the website but I'm not familiar with how using a certified financial planner would benefit me. I would imagine that whatever they draft up will have higher fees than VOO and in order for that to make sense it would have to outperform the increased cost. This is what's not apparent to me.

My goal here is to have some familiarity and information so I'm not going into this meeting completely "blind".