I guess it makes sense - as for persistence I guess no point in having any if you can just compromise the target again.
The most obvious reason would be the fear of patching a vulnerability which the attacker used to gain initial access. Persistence is required.
For example, a ransomware gang may compromise a company's network, steal data, deploy the cryptolocker, and then get out. There's no need to have persistent access; they got what they wanted.
my first thoughts is that this is actually a vector against people rather than servers which do reboot daily.