It also makes it easier for partisan rulings on a case-by-case basis. If defendant is on your team: allow it, if not, issue a self-contained ruling (or don't pick up the case at all if lower courts ruled against them).

We have front-row seats to how empires decline and fade away. I guess those who missed the 20th century decline of the British Empire (culminating in Brexit) can study this one.

Yep, peak hypocrisy.

The constitution says very little. Most legislation says very little. I don't think they are grabbing for power, they are just stating the obvious - this isn't covered, so I guess we'll cover it.

So the prior textualism was just tactical?

Textualism doesn't mean they say "i don't know, the answer to this very specific question isn't insanely obvious from reading the text".