Hey, I think this is important, Flint 3 relies on a Qualcomm chipset, so, at least some weeks ago, no vanilla OpenWRT was available for it (Qualcomm kernel).

On the other hand, if you can live with Wifi 6 and only 2x2.5Gbps ports (and 4x1Gbps), Flint 2 is powered with a Mediatek chipset, that runs a 100% vanilla OpenWRT.

Both are 1GB RAM, 8GB emmc little beasts that can even run some docker containers. IMHO Flint2 is in the top 5 for SOHO OpenWRT supported routers