here is my take on the green armchair.
that doesn’t look good. made in sketchup or imported from another app ?
that roll is not great.
raw
I used skimp on the weird roll thing. they still don’t look good, but now the file is 40% of the geometry.
a 4K texture for a chair is oversized.
Dajauna Chenille Accent Armchair.skp (1.4 MB)
end result is 35-40% of the original weight and complexity.
still looks the same.
and here is on the brown one
raw
post skimp and clean3
that one was better. same weight, half the complexity. No weird geometry-filled sausage that makes up to 50% of the file’s geometry 
Upholstered Armchair.skp (1.5 MB)
you might think I’m a pain in the chair, the models are perfectly fine, and I might think you handpicked two “clean” ones
because looking at your gaming chair, I get cold sweats.
that’s a lot of geometry.
and zooming on your screenshots, I see multiple chairs that are 20+ MB and I’m sorry to say, no chair needs to be 20MB.
imo, 4MB is already on the high side.
no wonder why I see more and more fat files in tech support, if people add 20mb per chair…
if you want to make your own warehouse, please make it lean. if you make assets as big as the normal warehouse, there is no real advantage in paying you is there …?