There's lots of citizens of UK happy today. For some it could be a waste of time. For some others, knowing UK laws are written in UK, it's a relief.
This may be lost on those not from the UK, but a huge amount of the cultural angle of the leave-vote was based on a "We don't want to be ruled by Germans, we beat them in WW2" - it was never about anything concrete, it's just about a vague fuck-you (in the wrong direction) in response to the Status Quo.
The whole modus operandi of Brexit - for decades - is to just make up anything that sticks and blame it on the EU, and because the EU doesn't have a public face in British life there's no feedback.
For example: https://www.theguardian.com/politics/2019/jul/18/boris-johns...
In Summary: We've either done something bad or pointless, all to please people who will be long dead before we get to have our cake and eat it in the future.
Most of what they think of as "law", such as criminal law or the rules of the road, always were written in the UK.
The "law" that was being written in Brussels (with plenty of UK input) was to a large extend rather specific and trade-related. Yes, it was evil EU legislation that mandated orange juice to contain actual juice from real oranges. Terrible!
All that will remain, though.
Such audacity! Such impervious intervention in our sovereign right to be f'''d over by corporations!
This is easily disproved by comparing the orderliness of their hair ;-)
Yes, I know Boris Johnson ruffles his hair on purpose.
First thing the Commission did after the Brexit notice was to publish a 'European Pillar of Social Rights' and to launch processes for common minimum social standards. Yes they do trade but look at the lineup and commissioners and half of those have social portfolios.
(and of course: historically a large chunk of it was the Conservative Party)