Perhaps it is, perhaps it isn’t, as you can tell from Bhante Sujato’s prior responses, there is some pushback.
However it is a recurring issue that has yet to be solved well to all users satisfaction. Indeed, I regularly “lose a few suttas” and cannot get back to them. I usually have memorized the sutta numbers I care about. And I also let Voice find whatever else I need. So the tagging feature may actually never come up in the context of Voice.
But sometimes I lose track of the proper phrase to find a sutta I want to remember. For example, I know to search for “vital conditions” if I cannot remember “sn12.23”. If I forgot both, I’d be lost and unhappy. So we should keep this need in mind and discuss it over the long term as we come to understand what Voice users may need to recall the suttas that are important to them. This was actually part of the Examples/InspireMe feature set, that we make all the common phrases known to all.
I am not happy with Chrome bookmarks. Google always messes with my bookmarks and throws them away for no good reason other than they are giving me “better technology”. Google has simply lost my trust. And even if bookmarks worked, there is, I think, a somewhat larger opportunity here to explore beyond bookmarks. For example, since Voice can find suttas by phrase, many of us have found multiple suttas that address any given topic. This diversity changes the notion of how we study the suttas. This “study by searching” is potentially richer than bookmarking. Indeed, perhaps users might want to organize a history of their searches. These are early days yet, so all of this post is just a bit of an inconclusive ramble.
For the backlog we might just say “How do I find/annotate a sutta I am currently studying?”