I think Asus routers are about as close as you can get because the stock Asus firmware itself is based on an opensource firmware, which means 3rd party projects such as asuswrt-merlin has an easier time to develop their 3rd party firmware because the stock firmware’s source code is available. They are more expensive than other routers though, which might a be a tough pill to swallow especially when vendors such as TP-Link sells their router for dime a dozen.