I don't think this pessimism is warranted. It's very easy to tweak these kinds of rules at this stage in development. Changing the way these kinds of abilities work is pretty straightforward and it's easier to get good feedback by overtuning tweaks and dialling back than undertuning and amping up. Their goal is definitely not the same as Solasta's but I don't think it's fair to judge their ability to make an insteresting system based on early access. We've seen from their previous games that Larian are extremely good at incorporating feedback from players into their games. They've worked small miracles on Original Sin so getting the balance right for BG3 should be a snap. I don't think their goal is going to be a 100% faithful recreation of 5E but I'd be very surprised if the blatantly overpowered moves made it in without adjustments.