Okay, I'll bite @Howpo.
I VOTED REMAIN. Things are NOT BETTER FOR ME. I knew they wouldn't be better for me so I VOTED REMAIN.
Because we have left the EU, I have had to CHANGE MY JOB. Although I still work in strategic HR, rather than just working to attract talent, I now work with employers in up-skilling both their current workforce and opening up opportunities for the available workforce via targeted recruitment and in-work training and progression.
I would dearly love it if all employers were 'Disability Confident' but alas, the very existence of this moniker shows we have a long way to go.
I HAVE NEVER DISPUTED what you say you've seen or are experiencing. I don't doubt for one minute a chicken processing factory struggles to keep staff, especially as this is historic ( especially now that low skilled workers have some workforce agency so the factory is forced to offer favourable terms - "choose own hours").
However, despite things being worse for me in my role, I do see people lifting themselves out of poverty by finding employment that was beyond their reach when they were competing with highly skilled and motivated workers from the EU.
So, the OP asked for 1 benefit of Brexit. There it is.
Brexit has left me a lot poorer. For some, however, it has offered opportunity.
And I really must get on now.