StitchingMoss - not all men are arseholes but they have the potential to be just as women have the potential to be unfair in a split too.
But let's be honest, it's still far far more common for women to be financially dependent on partner/spouse than men. Even if they're working the men are usually earning more.
It's also usually women that are responsible for the children after a split.
So it's really only sensible that women are advised to plan protectively.
I don't think anyone on the thread anyway has said it would be wrong for men to do similar.
Indeed a few pps have pointed out that circumstances outside the partnership could make it sensible if the family unit has access to accounts held in different banks etc I know a good few families locally really struggled when there was an issue with a certain banks cards not working electronically over a long bank holiday weekend due to a technical issue.
And some on the brexit threads have mentioned it may be useful to have accounts with more than one bank if the bank you use is based in Europe.
I myself also pointed out its not just if you split it's also if one becomes incapacitated or dies.
I've seen a relative completely screwed over following their unmarried partners death by "in laws" she previously thought well of.