Can you actually remove sudo from a system without breaking stuff? I can image there's some stuff, scripts etc that depends on it. Unless you can alias it away?
If all you want is root priv without remembering two passwords on your box, doas is fine. If you want a complex system of admins and users with fine grained permission control sudo may be a better option.
I use ' su -' much of the time and just use a root shell.
Actively replacing sudo with doas on an OS that includes sudo in the base system seems pointless imo.