SPOILERS follow. After almost 50 hours in BG3, I believe the complexity and beauty right now is in the dialog choices and their lasting effects in game.
I'm wondering how many distinct major paths are in early access?
I've done a "lawful good" playthrough as a high elf evocation wizard with Wyll, Shadowheart, and Lae'zel. (No, there's no strict alignment in 5e nor in BG3.) Lae'zel was not thrilled with me and didn't open up. I went for 100% exploration on that run and was happily finding things up to around 30 hours.
I then did a "chaotic evil" run as a drow rogue with Gale, Astarion, and Lae'zel. Lae'zel and Astarion loved it. I was pleasantly surprised at how different the interactions were, especially with Lae'zel, Astarion, the goblins, the drow, and others who you'd expect to be evil aligned.
However, there seem to be only a few major decisions:
1. Druid grove: ally with the tieflings and druids, or ally with the drow and goblins.
2. How to navigate the Underdark and get on the boat to the tower.
3. Whether to allow the Illithid tadpole in your head to begin to take over. On my "lawful good" playthrough I didn't engage at all, so I missed all the content gated on using its powers, seeing the lover and the city in flames, etc. Fortunately caught it on the "evil" playthrough.
There are hundreds of micro decisions. Save Volo? Halsin? Owlbear? Engage the devil? Kill Nettie? "Romance"? etc. but they don't result in huge changes to gameplay, cinematics, character development etc. There's great content there, such as the hag attempting to remove your tadpole or Volo's similar "operation".
Are there any other major paths and content?
I feel like I caught most of it with these two playthroughs and it's time to move on to another game until there's a major BG3 EA update.