The Deluxe EX pack is making me consider giving up

I really liked the idea of a pack that helps you get older cards you’re missing and guaranteed a rarer card in each pack. But after I opened my first pack today, saw the cards went into an impossibly large new expansion rather than filling in the spaces in the old expansion, I was shocked. So what, to fill it up now we have to get every card we’re missing TWICE and 300+ cards we already have again? And then when the pack disappears in a month we’ll just have a card dex more empty looking than it started? I am a premium subscriber but if this doesn’t get fixed I’ll be cancelling that and possibly deleting the app altogether. It makes it feel like this thing that was advertised as a means to “catch up” is quite the opposite.