The “presentation” cons you reference exist with iron sights as well. Where as with a dot, it just needs to be in the window. Also keep in mind that depending on the situation and distance, you may end up essentially “point shooting”. And as far as the RDS failing, that’s why you have backup sights. They also can still be used even if the dot is working. So really you have the best of both on one gun. You can even make the argument that a RDS is superior to iron sights in awkward positions.

https://youtu.be/mSK5k2lKOek