This is a truth very few people are willing to confront. My grandmother lived in a village, on a farm, growing her own food and slaughtering her own animals, with no working plumbing, using a well for water. Of course a lot of that changed even just moving up to the 70s, but at that point there still wasn't quite the consumerist "buy whatever you want from wherever and whomever you want and have it almost immediately" environment. I can go to a grocery store here in Canada, buy tropical fruits year round that grow nowhere near me. I never have to concern myself with "this ingredient won't be here because it is seasonal", it'll be there, it'll just be more expensive out of season, worst case I just have to go a bit farther out to a different grocer than I usually go to.

This point is valid. However, lifestyle improvement rate is something that's slowing over time because of physical constraints.

For example, the vehicle mortality rate is 1.44 per 100 million miles driven. That's down 17% from 2000 (so 25 years ago). However, the change from 1975 to 2000 was 53%. That's because as we get closer to 0, it gets harder and harder to improve those rates. On this metric at least, I don't think another 25 years will result in a noticeable amount of improvement?

In the other direction, some things will become scarcer (and therefore cost more). Real estate is the obvious one; we can't create more land, and we keep having more people. Easily accessible drinking water is another; desalination is getting cheaper, but it's still way more expensive than pumping aquifer water.

And some improvements are necessarily 1 time things. You can get tropical fruits year round, but that's been widely available since the 80-90's from what I can tell. So come 20 years from now, what will people be able to buy in a grocery store that I can't buy right now?