About the holo/UR discussion:
I actually never tried to complete sets, but I never aim for FA, RR, SR anyway. I would be happy to complete a set and forgetting the rainbow rares and golden items/stadiums. It would still feel complete to me. You'd need to open 20(?, probably more) boxes to complete all the SR. I don't think the rainbow rares will stay.
The holos. Yes, they feel worth less, but they are also sometimes harder to get than GX cards. There are more holos than GX cards in a set - Team Up had 19/11. So imagine if you don't want to buy single cards, it's often harder to get a specific holo than getting a specific GX. My last two boxes had 5 holos, 4 GX and 2 FA/RR/SR each.
So the problem are not the holos as cards, but the numbers, also of GX and their versions. If a GX is an ultra rare, a holo is an ultra rare too. If a holo isn't, a GX isn't.
So it's basically 9 holos+GX (same category) + 2-3 (if you're lucky) special cards.
The ways to fix this are:
a) Having MUCH fewer "UR" cards. 2-5 special cards, not 38 (in Team Up). How secret is a FA/RR/SR, if it is 1/38? And you need to open 30 boxes at 120-130 € each?
b) Having similar ratios, but smaller sets. 196 cards/3 = 65.33 > Jungle, and still 12.66 special cards. Still too many.
c) Different rates? 1 holo/GX every second pack could work. Then caving a rare in every pack, even if you a holo/GX/FA etc. could also work.
I would conclude, the ratios need to be completely changed, then the big set size (like in e series) is no problem either.
Team Up: 196 cards: 31 rares, 19 holos, 11 GX, 38 special cards (FA, RR, SR items)
Skyridge: 182 cards: 35 rares, 32 holos, 6 special cards
So if you'd make it like Skyridge the correct ratios for Team Up would be: 38 rares, 35 holos+GX (e. g. 25 holos, 10 GX), less than 10 special cards (maybe 5-6 FA, 3-4 SR). Then having 36 packs, you'd have 36 rares, 7-8 holos, 2-3 GX, 2 FA+SR. You'd need 4-5 boxes to complete.
Or 36 rares, 13-14 holos, 3-4 GX, 2 FA+SR. I would like that the most. Then, but only then, there could also be a few more FA, but the in my opinion you should have many more holos than special cards in the set and in a box, not twice as many special cards as holos.