My dad got me a Linux laptop as a kid (I was 10 I think?), and I am so grateful that he did.
To be fair, I already had a huge passion for computing, and it meant that I would constantly toy around with Linux, breaking things and learning how to fix them.
I have been a Linux user ever since, and I feel have learnt so much about computing because of it.
(I started on Ubuntu 12.04, with the glorious Unity desktop)
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.