Springs are small pieces of metal under stress and they can break. But, think about it. How many everyday items have springs and still function for decades without failure? Firearms come to mind. I've owned dozens of guns over the years and I've had one single spring break in one single gun during this time. I've had springs lose their "springiness" and need replacement but one single spring breakage over time in so many firearms is not a bad failure rate.
I've really only recently gotten into Benchmades but I do have a Griptilian that's about 10(?) years old with no breakage. To be fair, that knife has only seen occasional use over those years. But I don't worry about it. It's less likely that I'll have to depend on my pocket knife to save my life than I'll have to depend on one of my guns and I don't fret that those guns have an abundance of springs that could break.