[GrinningFool]

You've addressed the technical concerns well through a solid implementation combined with some workarounds (requiring specific configuration for searchable content and tradeoffs (ie9 bookmarkable content).

But this doesn't really address the usability concerns - you've mitigated them by introducing new interaction mechanisms... but these mechanisms don't solve the problems raised, they just provide a means to work around them. These workarounds are excellent in comparison to other infinite scroll mechanisms, yet not as friction-free as not having it in the first place.

Yes, this is all my unqualified opinion of course - though these opinions are what have stopped me from adopting Discourse.

[smacktoward]

> But this doesn't really address the usability concerns - you've mitigated them by introducing new interaction mechanisms

New mechanisms that the user now has to learn, as opposed to the scroll bar, which they already know and understand. And of course, every site that does this will implement its new mechanisms slightly differently, so you've traded a universally useful and understood UI convention for a range of site-specific ones.