People disagree. Personally I consider it to be something that is going to last at least 15-20 years with relatively minimal expense.

Some people think it’s just “it lasts longer than other things in the category.” Like boots that have durable uppers with replaceable soles, or a Toyota that requires less maintenance than average. Personally “buy high quality products and/or reparable products” Is not bifl to me, but to each their own.

I have a desk made out of 4” thick ancient old growth wood that was used in a cotton gin built in the 1820s. I’ve had it for 10 years and obviously, it still looks new. It’s 200 year old wood and a metal base. That’s bifl (and your kids’ lives).