The whole point is to actually replicate those parts of EU legislation which Parliament considers it would be useful to keep enforcing in the UK
Yes, but that is not best undertaken by replicating nearly all, and then weeding without a parliamentary overview as implied by references to Henry VIII clause etc in the article and elsewhere.
I know people are putting a lot of work into this, thinking about economic repercussions of the Brexit. But this is not at all about prediction making. This is more like, the EU wants some fallout in the UK so that afterwards noone follows up on Brexit. And this is crucial to the point where the existence of the EU depends on it.
Then it is a waste of time negotiating and the UK would be better off leaving without agreement.
Are you aware that most EU legislation has to be added to each country's lawbooks by the countries in question?
As such, there's a whole tonne of "EU" laws that will not magically be repealed by leaving the union.
The position varies from country to country. For the UK, some EU legislation is gold plated by member state legislation, some is not and applies directly.
And such goldplating laws are strictly speaking member state laws, not EU laws, and can be repealed by each departing member state at leisure.
Thing is trying to mix introducing (replication), repealing, and amending a large number of laws in a single bill is not an efficient way to proceed.
They do not seem to have grasped that when it comes down to particular laws and regulations, they will be saying to themselves.
Do we replicate, amend or repeal this? We do not know that yet because that depends upon the outcome of negotiations.
And if the negotiations drag on, there will not be time to properly scrutinise the details of the do everything repeal bill legislation.
I rather think it best to pass the repeal, to be effective from the left date, of all directly applicable or cascaded EU laws and regulations quickly.
And then separately add back legislation of whatever is actually required as an outcome of negotiations etc.