Freeloaders, like large corporations taking open source and then not giving back, is yet another symptom of a system that rewards extraction and self interest.
FOSS exists despite capitalism. The fact that people are willing to work on something out of their own passion, or sense of community, directly contradicts the fundamental assertion of capitalism.
Humans are not inherently greedy.
The following is just my own assumptions, take with a grain of salt.
Phones are often taken out to perform a quick task, then stashed back in a pocket/bag many times a day. As such, being able to unlock a phone quickly is a rather useful feature.
On the other hand, laptops are usually taken out to be used for larger tasks, and as such, do not need to be unlocked as often.
Fingerprint scanners add less value to a laptop than they do a phone.