I wondered if that would be the case. If rain is falling in the desert where it previously didn't, that means rain is not falling elsewhere it previously did.
I was thinking the water eventually, mostly, makes it to the sea in any case. But, it probably reduces oxygenation of surface water (?) and maybe increases levels of chemical transfer from land to sea? I wouldn't expect either of those to be significant though.
Any thoughts on other possible effects, or is it just a general 'it's probably shit in a way we don't realise' feeling?
As the planet warms, don't we get more rain? (Because there's more evaporation?)