Surely it just means things will chunter on until each individual aspect is resolved, or not
No it doesn't because a lot of the things that are advantages of the EU membership and that are causing difficulties are things that are available to EU members only.
If we aren't a member of the EU, we aren't included and we have to be treated differently (maybe WTO maybe even not that, I'm not sure).
For example, our passports allow freedom of movement etc for EU citizens. If we are not EU citizens, we lose that.
We can buy goods over the internet without import duties due to free trade within the EU. When we are outside the EU, we will have to pay import duty, like when you buy something from the US for example.
Plus loads and loads of other stuff. It's affecting one of my work clients badly because they want to import some dangerous substances from another EU country, but it's something that's made to order and takes a long time to make. They are panicking because they don't know when the thing will be ready and whether or not we will still be in the EU when it is. There are all sorts of safety and security considerations about transporting the thing that are quite easy when we are in the EU, but if we are not, it's much more complicated to import the thing.
Plus they then have to export the old worn out but still very dangerous thing that the new thing is to replace and they have been told that they are not allowed to try and export the old thing if we have just left the EU because the powers that be cannot allow it to be stuck in border queues. They can't bring in the new thing unless they know that they will be able to safely send back the old thing as they simply cannot keep the old and new thing at their site at the same time for more than a day or two.
Plus if they don't get to swap the old and the new thing over there are huge knock on effects for their business and in turn possibly for the entire country because it could cause shortages of some vital products that lives depend on that is used and produced in very large numbers by a few fairly small extremely specialist suppliers.
Those are the sorts of things that are at risk by leaving the EU without a deal.