I've just polished off everyone's loyalty mission. Should I start Lair of the Shadow Broker before Reaper IFF since I heard starting that kickstarts the endgame?
You can do it after endgame anyway - I think it's actually better end-game from impressions, don't quote me on that though.
Yeah I agree. Personally i leave it for post suicide mission to be honest. Apart from Overlord i usually leave all the DLC for after the Suicide Mission. It just feels right doing it afterwards and also you have a brief chat about how Shepard is feeling about having stopped the Collectors and the Reaper threat being still out there.
Arrival just makes more sense from a story perspective to do it after the Suicide Mission as well.