[p_ing]

Power usage is a good reason to stick with non-SFP ports.

And you can use CAT5e with 10Gbps networks given the run is short enough. I run 2.5Gbps over CAT5e with no issues throughout my house (I don't need that much bandwidth except when downloading Steam games).

[scq]

10Gbps fibre uses significantly less power than 10Gbps copper ethernet.

[lostlogin]

I read that parent comment as referring to POE, but am doubting myself after reading yours.

POE is a great reason for rj45.