This. I've had an always-on Pi 3 since 2016 and after countless random corruption issues from various micro SD cards, I moved to booting them from old USB2 flash drives, first an 8gb then an 16gb one. Never had an issue with them and they've been solid. I only had to mess with the flash drives when I had to do an OS upgrade.Also, those micro SD cards were always fine after a format/partition and I can still use them in other devices just fine. I've read before that the Pi has a tendency to corrupt micro SD cards through its reader, and IIRC it's related to power issues.
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