AFAIK, the general advice is to encrypt the whole HDD or at least the whole /home partition (and its Windows equivalent), because nowadays computers tend to store lots of personal, sensitive information and it would be a tragedy if someone manages to steal a laptop. The possibilities of frauds, blackmails, identity thefts, etc., in such a case are endless.
It is hard to argue against this. However, there still remains one problem: ANY HDD failure, even a flip of one measly bit, means the loss of all data. Even if someone is rigorous and makes a backup copy every month, the loss of a whole month of work is still unacceptable.
Personally, until now, I've never been victim of computer thievery. However, I've experienced HDD and even SSD failures many times. In all such cases I've been still able to recover the vast majority of data of these HDDs and SSDs that were not encrypted.
Admittedly, these experiences make it hard for me to explain to myself why sticking to this general advice is a good idea.