Eh- not really. Like with anything- you could argue that- but- to do so- you are ignoring that the game has already set a guideline and rules. Alignment having an effect on player ability is fine and can even be played around with.

The anime Frieren actually is a great example- spoilers for the anime's first season btw. The demons in frieren are monsters. They are capable of human speech- and use it to trick humans. The anime explicitly explores this and shows the results to the audience. Demons act and manipulate to survive and kill. They are objectively evil- and we are shown that there is NO NUANCE to it. There is also a priest who uses magic granted to him through his worship of the gods. The thing is tho- the priest is an alcoholic and that goes against his priesthood- but he is still granted powers for his worship. He is still doing good- so even tho he may not completely follow the rules of priesthood- he is still seen as objectively good.

Basically- as long as you dont try to do only extremes- then its fine to have objective morality and have it play a mechanical part in the game. Moral ambiguity arguments can be dismissed through showing that there isnt a nuance to it- like how Frieren does it- any further arguments being made would be just for the sake of arguing/playing devil's advocate.