For most of human history, children and parents lived together or close by, and parents died earlier in the child's life. If your parents died and left you an heirloom dining room table, it was quite likely you just didn't have a table, and at most you lived a few blocks away, so acquiring it was easy.

I'm in my 40s. Both my parents are alive, and have a house full of stuff. I live in a different house, 3.5 hours away at highway speeds, full of different stuff. It doesn't really matter to me if my parent's dining room table is a nicely crafted table - I have a nice table, and I don't need two dining room tables. Getting it to my house is a tremendous hassle. Picking between them is a tremendous hassle. And then I still have all the other stuff - the hutch, the chairs, the couches, the beds - and only one sibling to split them with.

"Rampant, commoditization consumerism" didn't cause this, longevity, freedom of movement, and independent living caused this, and I wouldn't trade those away for an heirloom table.