If Pegasus required physical access to your device that would be relevant. However, it’s installed through several other means and according to articles I’ve read can live in RAM. So restarting regularly despite never having an unattended device seems prudent.
One of the articles about it (I think from The Guardian) said that it can run in RAM which was one thing making it harder to detect. It said that it was present until a reboot.
If Pegasus required physical access to your device that would be relevant. However, it’s installed through several other means and according to articles I’ve read can live in RAM. So restarting regularly despite never having an unattended device seems prudent.