Yeah, WoT client-side is definitely another effective tactic.
Outbox model somewhat requires that you connect to other users' inbox relays to fetch replies to their notes, though. Unless, of course, you are making use of an aggregator relay that is pulling those replies for you.
When looking at replies to your own posts, your own inbox relays should be sufficient, but when looking for replies to someone else's note, there is no reason to expect that they will be available on your inbox relays, so outbox clients should be connecting to the OP's inbox relays to fetch those replies, unless you have added them to your blocked relays list.
