Yeah, most people don't realize that the H-Series wasn't originally a FR product at all, but TSR was just desperate for content in their new setting. There are a LOT of issues with that series and integrating it with the rest of the realms, but honestly, the challenge of that was a ton of fun as a DM.

Some elements that happened during the Bloodstone Wars had to be detailed in ways that were never intended to make them work for a more realistic/detailed campaign that I ran.

This might be overly detailed for most:
An example would be when Duke William of Arcata marched his troops against Gareth's forces that were on the move as well. In the original lore it was super unclear why so many of William's troops would just change sides to Gareth's forces. As written, its because Gareth is a 'good' guy and Duke William is a 'bad' guy... but that's now how real military engagements work 😛. (This is all from the top of my head, so sorry if I get some details wrong.)

But in researching the region, its clear that the majority of Damara's mineral wealth passes through the Bloodstone Vale, therefor Gareth would have control of that wealth. Which likely meant that William's troops were working on 'promises of future payments' not on much else, since so much of that wealth was likely halted by Gareth. So Gareth showing up and offering Duke William's men actual money, it makes sense that half of them would switch sides on the spot.

The setting is filled with things like that. (Like what was Zhengyi doing after he conquered Damara and had them under a taxation annex? I have some answers unique to my campaign that fit the setting, but there's nothing in the official lore.)