Which vendors are those? I could try to name some, but they might not necessarily be the ones you would come up with.

Allow me to rephrase.

You say that such complaints are just noise to Google because they have already acted on these complaints (ie, Pixel bootloaders are unlocked). On that, I think you and I agree re: pointless complaining.

I'm asking, why not continue to complain in an effort to push vendors with locked bootloaders to unlock them? Specific vendors are irrelevant, I'm just curious if you do/don't think people should complain to them, as well.

I don't know what you mean specific vendors are irrelevant, if you're not complaining to anyone in particular, then it's just talking into the void.

You've simultaneously demonstrated a misunderstanding of my comment, and - correct me if I'm wrong - answered my question.

My comment is not about specific vendors and their actions. My comment is only about wondering when, in your mind, is a valid time for people to complain; a philosophical question. That's why the question is broad - is it OK for people to complain about vendors who have yet to take action?

Your comment just now suggests that, yes, contrary to your post complaining about complainers, you likely think it's fine to complain to/about vendors who haven't taken action you'd like to see taken.

I'm not concerned with what's valid or fine or not, this is just if you want a chance to get your problem solved or if you want to waste your own time on a complaint that is to the wrong people. These out-of-context complaints/rants happen so often online that twitter even has a meme for it: https://en.wiktionary.org/wiki/sir,_this_is_an_Arby's

Edit: Your logic in the last paragraph doesn't follow to me, as I was responding to a specific complaint. So that's another reason I can't really give an answer to the question.