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After the last set of non-dom reforms it was shown to have very little effect on non-doms entering or leaving the country, so that argument, as you say, is extremely weak.
(This twitter thread is worth a read: https://twitter.com/arunadvaniecon/status/1621087079999639559)
slippers-
(This twitter thread is worth a read: https://twitter.com/arunadvaniecon/status/1621087079999639559)
Unless I'm missing something, that thread doesn't answer the most interesting question, which is whether the non-dom policy really attracts anyone that wouldn't have come anyway.
What it does seem to say is that the "bait and switch" approach is highly successful, i.e. increasing tax rates once people have already made the decision to come to the UK doesn't cause people to unwind their arrangements.
NickCJ
I don't know how you can say that with such certainty.
The pro case for non-dom is that it brings people to live and work (partly) in the UK that otherwise would not be incentivised to as they would drag all of their global assets into the UK tax net. I don't think it's a particularly strong argument, but then I also think there's a load of tax-advantaged investment that doesn't stimulate the real economy.