It's the prospect of slipping deeper into an overdraft, or displaying behaviour that could mean that sustaining the current lifestyle is not likely that is the problem in these cases.
EA and landlords cannot see into the future and, as far as I know, are not generally experts at financial forecasting. ANYONE, no matter how much they have in the bank, could suddenly become penniless or could trash a flat and/or do a runner leaving the rent unpaid.
Conversely, ANYONE could be living on their overdraft and not on the surface have a very healthy bank balance but could still pay their rent on time in full every month, maintain the property well and generally be a landlord's dream.
And, Eminybob, I am intelligent, thanks very much, and I do get that landlords can potentially lose money if tenants behave badly in any way. Which is why I say that robust references, good contracts etc are necessary and useful. I explain that upthread just as clearly as you explain your opinion.
And yes, I do realise that in theory anyone who works at my bank could look at my statements any time, although thank you for the patronising tone. I tend to assume that bank workers have better things to do than gawp at random customers' statements, though; that is not comparable to the actions of an EA/LL insisting on bank statements so that they can comb through them.
What do people have on their bank statements that they don't want anyone to see? Why would you care if a letting agent knew what you spent in Boots/Lidl?
If you want to be that secretive about what you spend your money on...
I am not 'secretive' about what I spend my money on; in fact I said upthread I have nothing to hide, financially.
I don't 'care' in any meaningful sense about not letting an agent see what I spend. I do not buy anything that I'm ashamed of.
But I maintain that my bank statements are not the business of any EA or LL. It's not necessary if referencing and credit checks are robust. And, on a point of principle, it is a challenge to privacy.