Home Office already brakes the EU law on immigration, and I have absolutely no doubts that it will brake it further.
The example I have in mind is that Home Office requires that EU citizens who are in education or self employed should have Private Comprehensive Health Insurance to have right to permanent residence in the UK, despite the fact that such requirement is literally illegal in EU. The law states clearly that if you lived somewhere for 5 years, you have the right to permanent residence in that country - but Home Office will ask you for proof that you had comprehensive health insurance as a student for example, before issuing the Right To Permanent Residence permit. So people like me, who lived here for 7 years now, and were in university for 4, are fucked, because all the time spent here does not count towards the 5 year minimum requirement for permanent residence(and of course no one at uni told us we needed private health insurance - we were told to register with NHS and could use NHS like any EU citizen without any limits). I live here, I pay my taxes, I'm starting a family, want to buy a house soon - and then I ask myself, why the hell would I, if I can literally get kicked out in 2 years because someone decides not to give me a visa.
I would have never considered leaving UK otherwise, this is my home now, but it looks like I will have to at least consider my options now.