The main benefit is that the RPI4 has substantially more CPU power & RAM than 95% of routers.
Been using RPI4 ($35) with a TL-SG108E VLAN switch ($30) works a charm.
Port 8 -> Access Port Vlan 8 - WAN
Port 7 -> RPI4 trunk port with vlan tagging
Port 1-6 -> Access Ports Vlan 1 - Internal
Not using WiFi (yet)
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