Use case or problem
I feel there are some limitations with the way Obsidian Sync is currently implemented that stop certain ways of working. At the moment you are limited to 5 remote Vaults and 4GB per Vault.
I personally like to create a Vault for each main project I’m about to work on, and have all of them synced. The reason for many Vaults being when searching through the Vault, linking notes, looking at tags, I only see the things relevant to that project and not all of my notes. I also have some Vaults that could be a lot larger then others. An example of this is a Vault I use for art references that is over the 4GB limit, while another Vault may only be a few MBs of text.
Proposed solution
Since a Vault is just a folder with a little bit of metadata inside the .obsidian folder there shouldn’t be any reason to limit this to just 5. Instead it should be “unlimited” (within reasonable constraints). Along with this change, the storage allocation should be shared across the Vaults, so you will have 20GB of pooled space, allowing some Vaults to be much larger then others.
On top of this, it would also be nice to potentially pay for more storage. Something along the lines of $10 for 50GB (I understand you wouldn’t be able to match the economies of scale that companies like Google/Apple can for pricing).
Current workaround
Go elsewhere for syncing, which is currently more difficult with mobile platforms.