Hi Felipe,
I've never heard of any benefit to using a single subnet for all interfaces, I've had conversations with Dell in the past about this and as far as I'm aware this recommendation is only to protect against issues that might affect the entire broadcast domain, storms etc. from completing knocking out access to your storage platform.
Splitting interfaces across multiple subnets gives some protection against this, and also lets you be a little bit more creative when it comes to routing the traffic should the need arise or the fancy take you!
Hope this helps
vM
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