Bait and Switch as far as I can tell.
A very complex way to provide relief for many but not all.
Nobody, anywhere has the straight explanation. It is complex, just as you said. That means it’s a snow job. Bait and switch for 3 years.
And the celebration they are throwing means they feel no pressure now.
That’s it folks, the whole thing. The sparrow farted.
The One Big Beautiful Bill should be re-named the Keep Tax Accountants Working Act.