BIFL are items we don't use, got it!

Jokes apart, I don't think any pair of scissors will last an actual lifetime (50-80 years) without sharpening unless you really use them only once a year. Basically, I think you're wrong, and that's OK, disagreeing is a thing.

With that said as well, there's plenty of things I personally thought lasted a long time (years and years) until I realized that indeed, people using them every other day or so would have them last a year or two. Scissors are definitely like that. For the record I only have fiscars myself (great mix of value, features, durability) and sharpen them +- once a year, sometimes maybe twice and use them maybe 2-3x a week for household tasks and thus they will last me probably forever (its been 20 years already) - but I figure many use them more like 2-3x a year.

I also have a pair of "shears" (as in medical shears), these don't need sharpening as often though I like to keep them sharp because they'll cut anything even when dull but its just a lot easier when they're really sharp (these cut fabric like jeans and stuff obviously).