I think a lot of people misread intent. No one is policing your conversations in your living room, but if you're an author (of any medium of art) your work necessarily interfaces with an audience (arguably you can create art without anyone else ever seeing it, let's take that as read) — if you're attempting to communicate with an audience its naive to think they won't have opinions on it, or that it can't be improved.
I like to imagine if you said this to James Joyce, or Georges Perec, Marcel Proust, William Shakespeare, Truman Capote, Samuel Beckett (or other authors known for being exacting) ... They could get pissy about it sure, but they could also say "What an excellent point, I could be way more specific, accurate and poetic in my prose."
While you are absolutely entitled to your opinion, do you not think it's a fruitful line of enquiry in terms of literary criticism and dramaturgy, similar to how using "nice" as every adjective is considered unimaginative?
Hunting blinds. Blind baking a pie crust. Blind devotion. Blinded by the light.
Cut loose like a deuce, another runner in the night. Wait, what were we talking about again?
I recall John Barnes, an English footballer, having a hissy fit because some sports broadcaster had referred to a stadium crush as 'a black day for football'. John Barnes said it was yet another example of a racist connotation of the word. Nope, John, it's just another meaning, you word hogger.
I'd say blind and ignorant have very different meanings.
Being blind to something means you are unable to register it, you might be searching for it but can't find it even though it's right in front of you, it's a sensory thing. Even being blind to social cues is a sort of sensory thing.
Being ignorant means you can see it but, perhaps due to a lack of open mindedness, decide that it is something else or assign incorrect characteristics to it even though eg measurements have shown different things. This could be due to a lack of trust, an agenda, or something else entirely.
Both of them make it difficult for you to learn the truth, but the causes and problems you experience are different.
Blindness, as I witness it, is not a lazy word for ignorance. It is used when someone did not inform themselves (enough). This could have been out of naïveté or out of malice, but also because one simply didn't know better. I think "blind" in this case is very accurate.
That really depends on which definition you're using, there are a lot of them, and figuring out which one it is depends on context. "Ignorance" only fits for one of those definitions, and it's not a direct replacement in every sense of that meaning.