Yeah I think floors have a drum effect where the sound reverberates around the void. I dont know if my footsteps are causing them a problem, i’ve got decent underlay for impact sound and can’t hear my own steps but no idea what it sounds like down there. Floors creak a lot though which might be a problem
No kids down there
Don’t want to speak to them because i’m awkward, and like you say they are just going about their own lives. However I do think they are taking the piss a little, they must be able to tell how poor the soundproofing is, so to regularly be shouting (like proper rowdy lads in a pub watching a game levels) is inconsiderate imho, its not like it is just weekends it is most evenings. I can handle computers games, and tv sounds, but sudden shouting is really unnerving.
Only actually spoken to them once after I moved in, the guy said ‘we’re pretty quiet’ and I remember thinking ‘the audacity, you are lying to my face right now’ should have said that right then nipped it in the bud