I think you should look at the pi in a different context.
Imagine you’re writing a book and you can’t get stuff done while you’re stuck here with the rest of us. You decide to sail around the world on a boat and use the time to finish that book before the deadline.
The solar panels aren’t enough to power a gaming PC, but they are enough for a pi and a small display. You don’t want to bring a laptop, because you’re really picky about the keyboards you use. However, a pi with your favorite keyboard with custom hello kitty key caps and fine tuned switches should make that experience more pleasant.
Even if you’re not stuck on a boat, having a limited environment like this could help you focus on getting stuff done. Sure, you could watch YT all day long, but you wouldn’t really enjoy it on this computer. Adding that extra threshold to distractions might give you the productivity boost you’re looking for. Unless of course if productivity means doing computationally intensive things like 3D modeling, animation, video editing etc.