Dear Neighbor:
I have no idea what's going on with your kid. All I know is they wail like they're being murdered all day, every day and have for the last 2 years. Are they poorly parented? I don't know. Are they being slapped around or being otherwise abused in some horrific way? No idea! Do they have some sort of spectrum or sensory disorder where normal things are extra baffling and scary or painful? Not a clue!
I also have no idea what your life is like. You are probably a good person who is 2 seconds from snapping and murdering everyone in sight. I would be if my kid was screaming their fucking head off like they were on fire for 2 years straight. The copious amount of weed someone in your house smokes is probably directly linked to this aforementioned situation to prevent mass murder or infanticide. I know that you're not from the US based on the extremely loud conversations you have with someone on the phone through an open window, so maybe this is some cultural approach to parenting.
That all said, mein got-- when your kid starts screaming their fool head off at 3 a.m. again for the nth time this month/year and this kid cannot self-soothe to save their life, I am halfway towards calling DCFS. The only thing that stops me is I have good friends who were investigated after their ultra precocious six year old was accidentally exposed to pornography at a playmate's house and then went to school and described what they saw in detail without any understanding of context. They ended up having to sell their house and leave that school district even after the investigation was over and nobody was found to be doing anything, because they were going to be under a level of scrutiny from then on based on the suggestion that something bad was maybe happening once upon a time. I don't want to put someone through that without knowing with reasonable certainty that something is wrong that needs intervention.
But something definitely isn't right, either.