Leather boots can, in my opinion, have their place. Leather shoes are often more hard-wearing, comfortable and maintainable, then many of the alternatives.
That does not include leather sneakers because in those the construction and sole will self destruct way before the leather, so you have a shoe with good upper and a crumbling sole.
But leather upholstery always seemed to me to be hard to justify. They seem to me to be functionally inferior and way more expensive.
Car seats... Noone ever had to change car because the seats were worn. And leather is hot in summer, cold in winter, and sticky against sweaty skin.
Office chair... Really? I have mine with a mesh back just to breathe a little better.
And with a couch... Just why?