Doesn’t have to be a thing you bought. Just some thing you didn’t have but then once you did it expanded your scope of actions.
The first obvious example that comes to mind is a car. Plenty of drawbacks to prevalence of cars, but being able to go where I want when I want, and far away, is very transformative.
I’m interested in other examples of things that aren’t just useful, but that open new possibilities.
I am handicapped and in early retirement. I had a hard time going on walks, got tired fast, there was always the fear of stumbling/falling again and carrying a bag was painful using a backpack made me getting tired faster.
I bought an expensive walking helper /walker with 4 wheels (not something you sit on and drive, but walk behind), a seat and a big bag for shopping. I feel like superwoman now when I am on a walk, because I can walk longer, buy stuff and just put it on the thing and it is so easy to get even heavy stuff home and whenever I get tired and no matter where I am, I just sit down, relax, power comes back and I can keep going.
The best thing I have ever bought in my whole life.
I was told this is only for very old people and that it looks ridiculous at my age and that I would not need it by everyone, fuck them. It is pure quality of life and increases my power to over 9000! I have been more outside in the last 12 months, than in the 5 years before that because of it.