OpenWrt is also very difficult to safely upgrade on some devices which I would also consider as a huge downside. I finally gave up and bought an old Dell off eBay and installed OpnSense and am much happier.
That looks so goofy
To that end: While it can be nice that OpenWRT runs on a quirky compact all-in-one MIPS-based consumer router-box (or whatever), the software also runs just fine on used Dells from eBay.