I agree with most of your list.
Now that we have these club challenges, the developers need to consider the prizes, if they were to increase the amount of possible members per club. Naturally, if you can have a hundred members, the club challenges would become that much easier to achieve.
Also, you can’t really control a hundred members. I doubt there are really that many players who want clubs to be that big. Sure, you might get stuff more quickly, but the chat would be chaotic, people asking and answering all the time. The chat interface would need to be a lot better.
Of course, everyone can decide themselves, what will be the size of their club - or what kind of club they want to join in.
The main problem, as many here have already mentioned, is the securing of the trades. At the moment, anyone in the club can just snatch the item that was meant for someone else.
I wonder how hard it would be to add a tag of some kind to the item, when you put it into the depot. A tag like ”to Sunshine Valley”. So, when you put an item in for sale, you could tap ”Private sale” and then you would get a list of all your friends, all your club members - and perhaps you could choose as many of them as you want. Surely that’s not impossible to do?
And really, the chat could be so much better in so many ways. At the moment it’s slow and somehow very difficult to use.
And you really need to be able to toggle the whole censoring on and off. I don’t mind a few curse words every now and then - the censoring is the same as in all American tv shows, it just makes everything harder to follow. If you want all the members to ”be civilized”, found your own damn club or ask for ”manners”. Or toggle the censoring on. They are just words, they don’t have any magic powers - even if you would try to give them some. Just grow up, people!
It would be nice, if you could enter the club, no matter what city you’re in. That's just one of dozens of ways this whole game could be faster and more intuitive. I’m still waiting for them to remove that useless slow flyover whenever I visit a new city or get back to my own. And in what year can I fast forward the catastrophes?
Finally, notifications might not be such a bad idea - although I myself have turned off almost all the notifications of almost all my apps over the years. :-)