“Never Mix Electrical and Mechanical Connections” (probably from tektronix) this is a rule, more so for power connectors. Strain relief prevents mechanical stress from reaching the connector joints/spring metal. The wire terminations are also cushioned by strain relief.
The PCB and Product Engineering should ensure that the mechanical stress or load is not a job/function/role of the connector. At higher currents a small contact resistance can generate a lot of heat, worsening the contact further, similar to thermal runaway of Power Transistors.
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Molex’s Sealed SFP Assemblies have smaller footprint on your pcb. The Sealed SFP – Small Form-factor Pluggable, assembly is an optical and electrical-integrated connection system, environmentally rugged interface. The Industrial SFP receptacle features a panel feed-through design incorporating an internally-mounted SFP cage and related electrical circuitry.
Sealed SFP Assemblies – Molex – formerly named “Industrial SFP Assembly”
Basic Connector Engineering – Overview of connector technology and applications – Molex Tech Library
The Connector:By Molex – A blog where the connector experts connect to communicate. From Molex.