The phone market is still rapidly evolving. For instance, I have a Nexus 5X right now. The fingerprint scanner on it alone is worth it. It was an afterthought to me when I got the phone, but now it's the single most important feature on the phone to me. The camera is also better than anything phone camera I've had before.

Also, I play some games on my phone, and having better hardware helps a lot with that.

What is so useful about a fingerprint scanner?

I could see how infrared sensor like in that new Caterpillar phone could come in useful especially if you are in a building trade, but fingerprint scanner?

You know that it's used for unlocking the phone, right? It's nothing like the use case you're describing.

You have to get a phone with one and use it for a week or so until its use becomes routine to really understand how big of a game changer it is. I subconsciously unlock my phone now every time I pick it up. It's amazing. Every day it saves me probably 60 seconds in total typing in stupid PINs, and those savings add up real quickly.

I'm still using my Nexus 4, that thing has pretty much already set the "good enough" bar we've come to reference for why PC sales are tanking. The only problem is a lack of security updates, but we can't blame the hardware for that.

Incidentally I had a HTC Desire HD before and that became unusable on newer versions, as is the Nexus 7 now. These two clearly didn't have the good enough hardware specs.