Agree but I feel like pointing that out is implying this somehow doesn't make things worse which I feel like is missing the point. This removes the implicit threat of prosecution for anything the president does.
Now no matter how much political will exists for the prosecution, the president is fully and unequivocally immune.
The only reason they separated out official acts is to stall the ruling on trump's case. If it goes back to the SCOTUS they will say all acts are official but rule on the very last day they can. They are doing this to delay it until after the election.
Remember that this whole time biden could have packed the SCOTUS and turned the Republican majority into a Democrat majority. Nothing in our Constitution says only 9 supreme court appointees. He's just not willing to do it because he is a liberal and doesn't want to use his power to crush the Republicans like they need to be.
If it was trump he would have (and did) wielded the knife of political power with no hesitation but the moment Democrats have the knife they hold it with fear the Republicans would accuse them of being partisan.
Sadly probably would never happen without a lot changing. It is really hard to get one passed unless it's supported by both parties and the Republicans in the US want this (requires two thirds vote in both the House and Senate which rarely happens for any policy that's actually worth passing).
There aren't really almost any Republicans willing to do anything against Trump at this point. I guess nothing is impossible given how bad things are but
I think the more viable option is just packing the court but biden would have to get two Republicans to flip and all Democrats to agree. It's embarrassing he didn't do it when the Democrats had Senate in 2020