Just want to add one "small" thing to previous message.
100% of adult collectors struggle to finish all his collections for minimal price. But both Panini and Topps wants to earn from us maximal profit. Because of this, collectors and publishers located on different sides of the pitch. And any our (collectors) success gives less profit to publisher. As well as any additional profit for publisher - it's a money from our pockets.
That's why Panini and Topps understand that they can earn more money from adult collectors by issuing different Hobby Boxes, but not in sticker market.
Now sticker market is more and more dedicated to kids. And for them publishers add parrallels into each collection ("my blue Haaland more rare that your green Mbappe! Nah-nah-na-na-nah!"), promote small bundles (eco packs, multipacks, etc) instead of 50-100 packet Boxes, and not provide all stickers in indidvidual service. Because by all this moves publisher trying to increase spends of collector to complete each collection. And if the adult collector by seeing this efforts, and decreasing quality, just not start such collection, kid will keep asking parents for extra money to purchase another bundle with packets (of course if parents have money for this) to find "blue Haalalnd". And kid don't care so much on sticker robust. He just want to have more shiny stickers, and all star-players.
So in my opinion, when we (adult collectors) ask both companies to improve quality, we should be ready to spend more. Because even if Panini or Topps put some efforts into few collections, and see that profit remain mostly on same level (because, as I wrote above, any of us want to finish collection for a minimal price), they just come back on previous quality level, and issue more parallels for a kids on a filmsy paper.
And even if some collectors decide to come back after see those improvements, they still struggle to spend less, and 100 of returning collectors in perspective not give more profit as a 100 kids with their marketing buzz.
P.S. Regarding the marketing buzz. I remember when I collect WC'98 stickers in 1998-99, I heard story from youngsters, that there is somewhere should be "Golden Ronaldo sticker", and to whom, who found it, Panini pay a money prize. And some kids keep to buy sticker packets just to catch "Golden Ronaldo sticker".)))