EU law has taken precedence over UK law as required by membership, so anything at national level has to conform to the terms dictated by Brussels. European wide standards require EU standard laws. Not being tied to the EU would provide flexibility if desired, not to adhere to their instructions. A common position might be desirable, but so would the ability to respond to changing circumstances. The EU doesn't stray from its rules based operation, so even if we need to react to a situation we may well not be allowed to. Our hands are tied by a group who owe us nothing.
The point is that over the past 40 years, this country has gone down the economic tubes somewhat. We are in an unhealthy position and the status quo isn't working for us, but that doesn't stop us having to pay year on year for the privilege. Only in 1974 have we been net beneficiaries of funds, and I remember the refund was flagged up at the time as being the exception. If we were net beneficiaries in bad times and funded others in good, then it would be easier to sell the concept of the EU to the man on the street - but we are only allowed to be net contributors.
What would have happened over the past 40 years had we not been members is speculative and hypothetical and we could have been better or worse off - nobody knows. But it is apparent that this country is haemorrhaging money as it stands due to the highly negative trade balance, and resources are finite. We need to take positive steps to move closer to self-sufficiency where possible. Being bound by EU rules is never going to let us nurture or support home grown enterprises. I would prefer that we spent our money on developing our own facilities rather than on propping up another state that needs life support. No country can be entirely self-sufficient with the exception of possibly Russia , or the US if it became less consumption minded.
Europe works very well for 5 of the 6 founding countries along with a few immediate neighbours, but southern Europe is a mess socially because of the commercial and financial flows back to the geographic and economic centre, i.e. Germany. Ultimately people need jobs, and that can only have any chance of happening with political union - which is only likely to happen in the short or medium term as the least bad option.
The rules are simple and straightforward. Any access deals require us to take instructions from Europe, who won't be wanting to do us any favours. All I see going forward is that they 'negotiate' continued payments to prop up their spending habits in return for access, while we have no say. There will be 27 countries, all pressing for their Brexit bonus. If we are 10 billion worse off now, then one can assume they will want that deficit to enlarge, to show that we are worse off. It's pretty unedifying.
There are many facets of an economy, but the best thing people could do is to put their money where their mouth is and conciously buy goods produced by people in this country. Supporting your own workforce is key to a healthy economy because it costs a lot to have people sat on their backsides doing nothing. Whilst we have a reasonable level of employment, we are effectively paying to provide for a lot of people in other countries. Whilst this might seem simplistic, we do need too start somewhere. Charity begins at home.