Joeri Of course I'm not speaking about the Connect feature here. That's unrelated to account ownership. But if two people have at least easyMoney, they can open as many Joint accounts (where both are full owners) as they want. The only limitation being the 25 overall account limit. You can also go over that, if the fee for that is worth it for you.
You're right that existing accounts that they already created in the past don't get changed to Joint accounts. Right now in bunq's system, account ownership can never change after the initial creation of an account. Given how easy it is to close unneeded old accounts and create new accounts, I don't see an issue with this. To the contrary, I don't think this should even be possible, as I can imagine that could potentially lead to legal issues.
You're also right that at the moment you cannot create Joint savings goals. That used to be possible in the past, but now the option to create new ones is no longer in the app. I can only speculate on why this decision was made, but maybe in order to simplify the app.
Edit: I just checked and it seems like this is possible. Just try to create a new Savings Goal and it will ask you if you want to create a personal goal or one shared with others.
So are these the issues that you want to have addressed or am I missing anything?