Because OneTab appears to suck. I've just lost over 400 saved tabs due to something that was apparently already a thing 3 years ago! https://www.reddit.com/r/chrome/comments/76k23b/onetab_lost_all_tabs_recovery/?utm_medium=android_app&utm_source=share
I only have two LDB files left, which I hope I can somehow recover. But I don't want to rely on this extension in the future. So recommendations for alternatives would be nice.