I'm a fairly vocal fanboy for the FG ruleset (disclaimer, I'm a playtester for the development group although personally I'm about as technically knowledgeable as the average rock).
I've been running a game every other weekend for about a year. I've been playing in a game the every other weekend for more than a year (whenever the ruleset came out).
I am NOT a big fan of massive automation in the rulesets so the Conan table is perfect for my style of play. I don't know how you could automate it to the level of 5e without causing a nervous breakdown for the GM having to constantly pull back on the computer not being able to recognize all of the variables in the 2d20 ruleset. "No, I did not want to spend that Momentum on damage, I wanted to spend it on pulling this cool maneuver. Should I reroll, GM?" The 2d20 rules are designed for every action to be a bargaining session between the GM and the player. That's the "cool" factor for them. I'm constantly adjusting the 5e automation results in my 5e games because the software cannot handle the variables in that system. 2d20 is exponentially more complex in possible outcomes (but ironically easier to play as the game flows). Too much automation actually slows down the game IMHO when it takes the place of GM judgment.
I also play in FGC because I have a lot of issues in FGU (for all rulesets). The CoreRPG sets have an easier time in FGC. That being said as FGU developed, the 2d20 ruleset had to constantly be tweaked. The developers adjusted accordingly at a fairly quick response time (some people disagree and think they were slow; my reactionary and snotty response: I say get a life, these guys are working all the time on this ruleset). Also all of the FGU rulesets have weird font issues right now (I'm looking at you, AD&D 2e and Pathfinder 2e!)... The Conan FGU set previously had a couple of columns displaced... The other game systems are worse because in some areas you can't see the fields at all. I could live with it (if I were forced to run it in FGU in the first place).