I have many nerdy friends who have been Linux users for ages. But most of them don’t know such a thing as Openwrt exists or have never bothered to give it a try. It’s a very fun piece of software to play with and can be extremely useful for routing traffic. Wondering why it isn’t more popular/widely used.
For my ISP it’s actually cheaper to not use their modem+WiFi router as they charge a monthly lease on the equipment. I declined it and they provided me with a modem for free. All I have to do is plug the modem to my own router and that’s it!
The features you listed seems pretty standard to all routers these days.