If the portrayal of Kynes was "a forgetabble "generic strong woman"", didn't that apply to (at the very least) both Gurney and Duncan also?

It seems that you wanted to see a different film than the one Villeneuve wanted to make.

Kynes was perhaps a critical but yet very minor character in the novel and arguably was a forgettable character. The reason it may seem otherwise is that Kynes was first portrayed by that notorious show-stealer Max von Sydow.

Casting a Black female actor instead in the role of Kynes is merely license as opposed to and starkly contrasted with the sacrilege of Liv Tyler stealing all of Glorfindel's thunder.

I thought Sharon did a fantastic job as Kynes, one of the more naturalistic performances in the whole movie.