RussR
En-Route
If you're careful and organized, of course you'll be fine: corporations and governments have data going back to the 1960s or earlier, that started on punchcards or reel-to-reel mag tape.
The point is that an electronic logbook requires you to do all that extra work and stay on top of it to make sure you don't lose it over the decades. A paper logbook in a fireproof safe will outlive you without any extra effort.
I have no objection to using an electronic logbook, but it's always secondary for me, never my primary reference.
I think you're making a really big deal out of nothing here.
"all that extra work"?
There's basically none. I currently use myflightbook for my electronic log. It automatically saves backups for me on my own cloud drive, every night. If @EricBe were to just decide one day to pull the plug on the whole thing, I could turn around and upload that backup in .csv format to another electronic logbook. Might be a little bit of data massaging, might not.
That's not any amount of "staying of top of it", especially compared to the ease of use and convenience and overall time-saving features of the online logbook. It doesn't even require being particularly "careful and organized".