I think we see that with two of Labour's key manifesto pledges would be either impossible or very difficult to do with EU/SM membership.
Firstly - VAT cannot be levied on private school fees under EU law. Potentially you could argue for some exemption but I think it would be very slow.
Secondly - Labour's idea of "nationalising" the UK railways is really at odds with EU policy. Netherlands has an ECJ case pending because they do not allow private operators to bid for at least parts of it. I think this could potentially be mitigated but it is really not the spirit or direction of travel of EU law.
I think it's also important to add while a lot of legislation wasn't repealed, a lot of EU legislation is not being added to UK statue books. I think the UK would want to take a very different path on AI regulation vs the EU for example, and had we stayed in would have been a huge point of contention.
There is a lot more nuance in this Brexit argument. While I certainly didn't support it, this does not mean everything the EU does is good, especially in tech. There is too much black and white thinking going on with it. I'd also add that EU growth has been exceptionally poor compared to the US. Something is going wrong in Europe as a whole; and I suspect poor quality overregulation by the EU on growth industries is a (potentially small) part of that picture.