Not being able to do this is pretty annoying on Monzo.
Other than that my major issues with Shared Tabs are the inability to:
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Add outgoing bank transfers.
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Add outgoing Monzo-to-Monzo transfers.
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Add incoming bank transfers.
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Add incoming Monzo-to-Monzo transfers.
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View how you or others have split a transaction after it’s been added to a Tab.
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Edit a transaction split that you have made on a Tab.
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Add a new member to the Tab part way through.
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Add communal notes to Tab transactions (eg: to remind people what a transaction was for).
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Settle a Tab without closing.
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Settle part of a Tab (but I guess if outgoing transfers could be added to Tabs, you could use that as a workaround).
I think those features would include pretty much everything Splitwise can do.
NB: quite a few of these features (eg: communal notes, amend split amount, split outgoing and incoming bank transfers) would be really useful for Bill Splitting too !