I'm definitely of the crowd that loved POE but had no idea that deadfire was even a thing.
If I'd known I would have backed it from day 1.
POE was the best iso crpg I've played since the glory days of BG and IWD, a close second is Tyranny.
Its not just nostalgia either it's genuine enjoyment of iso CRPG party control gameplay. I wish there was more of it but it can be hard to find good ones. I really tried to get into pathfinder kingmaker but its buggy as hell and kinda clunky gameplay.
People have discussed deadfire sales and POE3 again and again and all sorts of reasons crop up but some I see voiced a lot by players is too much narrative, not enough gameplay, setting wasn't typical fantasy setting.
I think all these points a terrible because the narrative in POE and POE2 paints a really immersive world one of the best in a long time, the games weren't the longest but had sufficient content to keep you busy both for the side quest story OCD's and the power big fight min maxers.
Lastly the setting was refreshing. Fantasy is always set in the same dark age medievil tolkien-esque eurocentric setting. There is nothing wrong with this setting but its been done to death. Setting a rich fantasy world in the early age of exploration was amazing. It also gives oportunity to explore some really adult themes such as colonialism, resource exploitation, salvery and land title. It may have been set on a ship but you didn't have to be a pirate as many claim, you could be a merchant, an explorer, a raider, the game lent itself to any of these ideas with its faction choices.
I'm still holging out for a POE3, but then again I've been waiting for KOTOR 3 for years and what we got was a lacklustre MMO so I'm not holding my breath sadly.