Yeah, one downside is what you said that you can have a bunch of open tabs which is the whole problem this tool looks to solve! The other downside is that tabs don't sync across devices and your bookmarks in Runneth do (as long as you're logged in).
I can appreciate the minimalism = focus argument but I don’t subscribe to it. My Chrome and Firefox tabs sync across devices as long as I’m signed in, as do my bookmarks and extensions.
