Cons of having multiple brokerage accounts under one broker?

I use fidelity and am planning on separating brokerage accounts into three different accounts: (1) Long Term ETFS; (2) Individual Stocks; (3) High Risk Plays. Are there any cons from this setup I'm not seeing or considering? My primary intent is mental organizing and tracking the different strategies over years to see what I prefer and what performs best. I have so many positions under my one brokerage account, I'm looking to organize it a bit more. link

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