I think asking publicly visible devs about it on Twitter is a great idea. I'd do it myself but I don't do social media. I'd be interested to know if people are on there asking them about this though. If not, I'd be shocked. There's almost no YouTube videos about it either, other than ones from smaller channels. This whole situation is like the most Orwellian shit I've ever seen in video games media. The game literally cannot be played past Act 2 and no one is saying shit about it.
If you're on social media, by all means please do this. Put them on blast, politely.
People are in Swen Vincke's replies, in their Director of Publishing's replies (@Cromwelp, I don't actually know his full name because he does't list it anywhere but he's listed as an Affiliate on the official Larian Twitter), and on the official Larian and BG3 accounts. If the other devs have accounts on Twitter, I cannot find them at all. No one else who actually works for Larian is followed by the main Larian Twitter, except for their VAs.
But anyway, people have been asking Vincke and Cromwelp, but absolutely no replies. Vincke posted about how their programmers are working on the memory leak issue in their engine on his personal twitter, back on November 2, and then absolutely nothing but posting about awards and concerts. Cromwelp just posts about other video games he's playing. It's very frustrating none of them care to communicate with their players.
ETA: Honestly, it's better if their employees don't have much presence on Twitter due to the tendency people on there have towards harassment in large numbers when they're upset about someone/something, but Vincke is the director of Larian, he does use his personal account to post updates on patch/hotfix development that is shared nowhere else the general playerbase will see, he should be be talking about this issue with Act 3 there at the very least.