"To be honest, it's a not a great system in that stuff falls off my radar."
That's a feature, not a bug. A system that doesn't let things fall off your radar is a taskmaster, not a servant. You have to let things fall off your radar.
Maybe not, if there's no way to differentiate between something that has fallen off the radar, and something that is currently on the radar (I mean that all the tabs are in one big flat list, no matter if they're relevant or not). Also, if additional cruft increases the search time (i.e. how long does it take me to find the right tab from among these 2000 open ones) then each unused tab is a small additional burden. I'm not arguing for or against any position that works for anybody, I'm just pointing out some possible wrinkles I see from the outside.
That's a feature, not a bug. A system that doesn't let things fall off your radar is a taskmaster, not a servant. You have to let things fall off your radar.