Almost everything that has become indispensable in my life took years to integrate into my life to any significant degree.
"Need" is a weasel word. You don't need anything.
That feels uncharitable to your parent commenter. By that logic we’d never use “need”, and your use of “significant” would also be a weasel word (I don’t believe it is, merely making a point).
While the words used are important, we should strive to understand the idea being transmitted and steelman the argument. “Need” is relational. Some things you need to survive (even if technically you don’t need to live, and here we’re getting too philosophical), other things you need to feel comfortable, or you may need a chair to reach a high place. In this case your parent commenter is clearly referring to a subjective level of need which differs for each individual and trying to make you reflect on the balance between the things you keep and how their existence in your day-to-day affects your life.
As it stands, I have a workshop and electronics bench with many tools that will go unused for years but are critical when I need them and too expensive to buy and throw away.
In reality the mindset they should be having is that the buyer and the seller are doing a group buy separated in time, which means that both paying half the price of new is fair and should be expected.
That is quite the frustrating state of affairs when you try to reduce your consumerism and buy second-hand. It’s not that uncommon to see people selling used items at the same price or even more expensive than new with warranty.
Examples always tell the story! Can you give two or three?
2. I might get a new [thing], but not make it to the [place where I can safely use [thing]] for a while
3. Videogames, or games in general
4. Idk sometimes I get depressed