What happened to Jagged Alliance: Flashback? What happened was that it didn't have a chance.
Two things were working against this game: The sub-standard budget ($360,000 Kickstarter budget + however many sales this game got on Early Access at $30 minus royalties) and Full Control's developers, who have in the past turned the board game Space Hulk into Space Suck through a ham-handed understanding of the mechanics and lack of polish.
The former is unfortunate - because of this, features had to be cut. Features like character animations, a bunch of the mechanics from Jagged Alliance 2 (which is telling, because Flashback was supposed to be a lot like Jagged Alliance 2 with v1.13 patch features), running and managing your own base of operations, and skill trees. The developers didn't have enough funds or manpower to implement everything, which is a major disappointment.
The latter is also unfortunate, because this game has one of the worst looking user interfaces I've ever seen. There's only one font for this game and it's an obnoxious '90's looking Geocities font that slides off the eyeballs. Thankfully, there isn't anything worth reading here, because the character bios and flavor text that help make Jagged Alliance's storytelling have been neutered by word limits and bland writing. The enemy AI is poor, the kind of poor intelligence that makes enemies stop when they see you and open fire, like dumb turrets asking for a bullet in the face. There's all sorts of minor yet annoying bugs that coalesce into one huge Megazord of ♥♥♥♥. There is voice acting from every one of the mercs, but a lot of them re-use lines from Jagged Alliance 2 except in a worse manner OH ♥♥♥♥ HERE I AM COMPARING THIS GAME TO JAGGED ALLIANCE 2 AGAIN.
All of this is a huge leap backwards, turning this Jagged Alliance game into something functional yet generic. I did have a little fun (I ran out of bullets for my squad thanks to terrible loot distribution, but had three or four flashbang grenades. So I had my gunner flashbang all the mercs while my melee-only character runs up and delivers fists of death into faces), but I'm not interested in seeing where this game goes because it's too much of a mess to play.
I will say that the soundtrack is good and is successful at capturing the spirit of the old Jagged Alliance games. And I admire Full Control's persistence in trying to fix all of this with post-launch support and soldiering on when things look seemingly impossible. But I haven't seen anything in the past 16 years that would be a true successor to the franchise, and how Flashback turned out I don't think I'm ever going to at this point.
Rest in peace, Jagged Alliance.