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.
Moving to a city with a tool library. For an annual £20 fee I can borrow any of a myriad of power tools. Currently using an orbital sander for some DIY, previously borrowed a hedge trimmer for the garden, it’s freaking great.