yeah but this is searching thru editions past for sourcebooks that may or may not have any relevance (not to mention the fact that most sourcebooks are a chore to read). the default 5e setting 'lore' is basically nothing but some familiar city names and yeah you could go back and read a bunch of ed greenwood stuff and apply it to your campaign...but what's the point then? it's basically 2e or 3e settings with 5e mechanics.
but then we come back to the question of is 5e just a ruleset/set of mechanics? is it a system or a world? to the question of could you ignore the lore? with 5e there isn't any lore to ignore...so yes.
5th edition D&D is no different than it has been in the past. The only difference now is it's FR that's the introduction world and not Greyhawk. Why has 5th edition suddenly done something that's been going on for years?
There is nothing in HoTDQ that you have to use. There is no Forgotten Realms specific mechanic that if you leave out the whole system stops functioning. Have some of you even read the module or even really read FR for that matter?
The stuff some of you are coming up with is actually very amusing.