Comments about ERC settings
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Some signals (PS_ON_N, BACKPLANE_RST_N ...) have a specific No-ERC directive to disable IO Pin connected to Output pin error. IMHO, placing No-ERC on some signals can be confusing. What about changind the connection matrix to avoid reporting error? I think this error is not relevant with such design.
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not connected pins have a specific ERC directive thus flooding the ERC report with "Net XX has only one pin". I suggest to put non-specific ERC on such pins.
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I'd set the connection matrix to report all unconnected pins as error, not warning as it is now.