Don’t know if it’ll cover all your use cases, but I was looking for something similar and recently got my hands on a Steam Deck. Have been very pleased with the purchase so far. To be fair, I haven’t gotten into customizing the desktop yet, but I’m sure anything’s achievable since it’s just running Arch.

I’ve found EasyEffects also useful for boosting volume on sites with quiet video. Set up a hotkey to enable a compressor with gain when that happens.

Here’s a great article published yesterday on how science seems to be fueling the meaning crisis:

https://bigthink.com/13-8/why-science-must-contend-with-human-experience/