I would love if they bumped the trade center storage up. The thing that I enjoy the most about this game is the animal breeding. I'm not an artistic soul and every time that I have tried to make a pretty habitat it looks like a 4th grade diorama. But I do enjoy trying to get better animals and breeding the harder ones (hello, pandas).
Back in the day when the game was first released and the limit was 30, there was also a caveat that you could still store animals over that limit, you just couldn't purchase animals over the limit. So all one had to do was get all of their base animals in the zoo to start a breeding program, and then you could have as many animals as you wanted in the trade center. I had over 500 before they changed that. When they did change it I had to stop playing for a long time as it's hard to determine a path forward when you have 500 animals in a trade center that allows 50 (I think that was the cap when they enforced the change?) I also believe that the current limit is 200 due to performance tuning as when I had over 500 the game would often get "disconnect" errors from the franchise server and I'd have to wait a few minutes before I could resume playing. These would happen a few times an hour. So, annoying, but still mostly playable.
Was/am I an animal hoarder? Sort of. However, the rest of the community benefits from my efforts as I sell off the non 100/100 animals at their suggested trade price. So average Joe could walk up and get a 92/100/83/83 Reticulated Giraffe for around 800CC (I think). Sometimes average Joe would then flip my animals for 10,000 CC, which is frustrating but there's no control that I have over that.
But back to breeding and the numbers involved. Let's take an animal like the Reticulated Giraffe. In order to breed this minimally I need to have 1x male that is not of the same line as the other females, 4x females that are the next set of breeding pairs, and 1x male to be the next "not of the same line" for the next set. So that's 6x giraffes at bare minimum just to keep a program moving. However, anybody that has played as a breeder can tell you that if I take a random 100/100/x/x male and pair him with 4 100/100/x/x females that their children could be all over the map. So the reality is that if you want to be a good breeder, you need to have around 10x males and 15-20x females so that you can create good pairings and have very good offspring. So that's 25-30 spaces, just for Giraffes. For animals with different polygonal setups it can be even worse (elephants, gorillas, chimpanzees, etc). So with 200 slots I can have around 13-14 species in my zoo. That's very limited.
I know that I'm in the minority in how I play. I know that for whatever reason people tend to look down on this style of gameplay. It's a game. Not everybody plays the same way. If they had a constraint that a habitat could only have 200 pieces of building items, people would certainly complain. One might argue that you could make a perfectly acceptable habitat with 200 pieces, so why do you need more? Same idea with the trade center. I can play with 200 slots, but it severely handicaps how I choose to play the game. Please expand it.