You are looking from a single worker's perspective. A more realistic example is 4 workers used to make 4 chairs per day, and now 3 workers can make the same number of chairs. Boss makes more money. No net gain for the remaining 3 workers (and the laid off worker has to find another job, potentially for a lower salary).
I didn't know I wanted a smartphone. Ads didn't make me want a smartphone. But when I got a smartphone I knew I wanted one.
I hope you noticed that this somebody is someone else and not you. It could be another executive from another company.
The thing is, people don't care about stuff, because stuff is cheap. They need money to pay for housing and they need only the money, because if people stop consuming and spend more money on housing, the housing gets more expensive even for those who would have otherwise spent their money on consumption. Those people also need more money, not stuff, to spend on housing.
When things get more expensive for no reason, the economy must grow regardless of whether people want to consume more. Most wealth is about the allocation of already existing stuff and transforming it into something convenient. Humans didn't create the oil or iron ore in the soil. They just dug it out. Stuff is never produced, only transformed, so economics will always be about fighting for getting that initial endowment.
I understand why you would want brand new chairs. My brain also does want them because they are pretty, because they goes well with your interior etc ...
But brand new chairs are far from a need we need to solve. And we are destroying our planet and our workers health for more chairs than there is asses on this planet.
As an exercise of thought, if we magically stopped the economy now like, everyone stopped working and paying for housing and credit and given a magic influx of food, most humans in the world would not need anything else to be happy for a long time.
Of course it’s just an exercice of thought, we do need to replace some objects sometimes, we do need people to fix things. But apart from food, there is barely any object that we would need that isn’t already available somewhere in the world.
The thing is, mostly nobody is a farmer : most people in the world are producing or helping producing things we already have.
Imagine your job is producing chairs. You make 1 chair per day. Now you get a machine that improves your productivity and you can make 4 chairs per day, but your pay doesn't increase, instead the executives pocket all of it!
But what about the 3 extra chairs? Somebody somewhere gets chairs that wouldn't have got them if you had been producing 1 chair per day.
Wealth is about stuff, not money. If more stuff is produced (that is useful) then people become wealthier. So unless those executives are somehow taking all those extra chairs themselves there must be done other beneficiary from the extra productivity.
It's far more likely that regular people have a growing desire for more stuff than the executives using up all those extra products themselves.