I jury rigged an ikea desk into a permanent standing desk and use an ikea bar stool without any cushioning and it actually fixed my back pain even though I rarely stand.
I think it’s because the chair forces me to sit more upright and not lean back into the backrest, since I can’t push myself closer to the desk when I sit since the chair has no wheels. And my legs are pointing down more than in a normal chair so it opens my hips up and thus there is less pressure on my lower spine.
First also happens but they end relationships rather than start one. How many marriages have failed because of a DIY reno project that halted progress for years.