So "New Content" in the subnav bar, when clicked you are presented with the new threads/posts, and at the top of the page you select between New Content (default) and "Recent Activity" as page tabs?
Then you can remove one link from the members section?
Since New Threads is used so often, they'll also be exposed to the other data which will get it out from being so hidden.
The only thing I'd add is to have a tab for GENUINELY new content - not the slightly misleadingly named 'New Threads' which is 90% not new but updates, but the really fresh new stuff,
the Starters.
I do find it a pain how the current options continually swamp me with a mass of clutter consisting of updates on threads, or types of threads, I have seen many times before which are irrelevant to me. I have no way to mark this irrelevant stuff so it stops appearing and cluttering the search results.
There's an addon to control this, but I'm talking about here on XF, or any board of comparable size which doesn't use the addon.
To find genuinely new material - Starters - there is no alternative to scanning pages of clutter titles on New Threads, or Recent.
If I haven't visited for a few days there can be quite a few Starters with 2 - 20 Replies, so number of Replies doesn't help me. For people who visit more rarely obviously it's far more difficult to keep up with the genuinely new stuff among the mass, and number of Replies will be even less help.
I find it quite a severe memory test to recall if I already hovered/ opened a thread and decided it was irrelevant. Sliding down between 2 and 10 pages of New or Recent, that's a lot of triage to do on pure brainpower! Subject lines are not always helpful, and the section name is small and pale, so not at all obvious to help.
The only option I have to do selection is Watch. But to Watch all threads except the definitely irrelevant would be a HUGE bloat on my Watched list, and dilute its usefulness. Also to Watch requires me to actually open each thread - I cannot hover, decide yes that's at least possible, and click it at its top level to Watch it. So opening up most threads individually to check their potential interest longer term, but not immediate interest, to Watch them is not workable.
Plus even if Watch could be a top level click to partner hover/ read popup, it still doesn't identify the genuinely new Starters.
Personally I think that Watched Threads and Starters would be a very powerful system. Best of all four options:
Recent ( = all)
Watched
New Starters
Watched PLUS New Starters
Once you had your own Watched list established from Recent, you'd then only have to check the New Starters to add to it. Or just monitor Watched PLUS New Starters.