"Most home users" are never going to install OpenWRT on anything, RPi, or otherwise. Of those that do, it seems likely that they will max out the throughput of a RPi, especially now that >100Mbps internet is common place is some countries, and is becoming increasingly available in others (like the US).

There are some RPi like boards with a single GigE, but they suffer from having smaller developer communities, and still come up short on IO when compared to a networking platform, which will typically have 1-2GigE lanes to the SoC, integrated 2 or 3 stream 2.4 GHz WiFi and a 1-2x miniPCIe interfaces.

Right now, probably the cheapest most capable router is the Ubiqti EdgeRouterX for $50 (no wifi though). It has a 2 core/4 thread MIPS CPU that can do ~1Gbps NAT/ROuting with hardware offloads and ~500Mbps just using the CPU and DMA hardware.