He still has made by creators personality there, even if its a little more boring than other links.
Miyamoto failed at creating a self insert, he can say its one a thousand times, but it doesnt help when other zelda directors start adding flairs of personality to him here and there.
If no talking is an excuse its a terrible one.
Ok, lets compare him to Byleth, that actually talks in battle. During dialogs with your students hes has basically no facial animations even when the camera is pointing his face and you can choose options on the dialogue to make your own personality. He is a nearly blank slate and apart from that you can choose male or female, main characters in the 3ds fire emblems go even further in customization.
In the contrary Link (even in BOTW) reacts in cutscenes, reacts to even stupid things like making food, has a ton of personality in his animations, and the most choice you have is "do you want to do this thing" with the option "Yes or no". Thats an already personality established game character, it doesnt talk but it doesnt matter you are not changing a thing from him apart of his clothes in BOTW. Its the Geralt without voice (and even geralt can be changed more than Link, making a version of him that isnt canon with the books).