I agree Geoff. I think they just want to retain the ability to enforce.I took some time yesterday to look at the legislation which created the rules and its enforcement.
I only went so deep as there is a lot of it, and I am no longer a paid lawyer.
Firstly, very briefly, the Schengen Agreement was started by 5 countries and others joined later, including some but not all EU countries and also some non-EU countries. Its initial purpose was to agree free movement of the Citizens of Schengen States. The Agreement was separate from the structure of the EU. The EU adopted the Schengen Agreement by the Amsterdam Agreement of 1999 and requires EU Member States, but not all e.g. Cyprus, to adhere to Schengen Rules.
Aside from Schengen EU has always allowed EU Nation States to retain control of their borders.
Thus at present we have three parties involved in the control of these rules -
1 Schengen, including non-EU States e.g. Norway.
2 EU, which has some Schengen and some non-Schengen Members
3 Individual Nation States controlling their own borders. 'Competence' in EU-speak.
The EU and Schengen have laid down rules for entry and exit of Citizens from non-EU States. Howevr, we now have Nation States like France and Portugal allowing stays for non-EU citizens beyond the 90 days under the EU/Schengen rules. Fine one might say because the Nation States have retained their 'competence' to do this. This would be fine if the visas they issued were to confine the holders to time in thaqt state, but France in particular has announced that their visa permits entry to other Schengen States, but does not restrict that to the first 90 days from when they entered France, so also Schengen.
I have found no reference to whether EU/Schengen have accepted or are challenging the right of holders of these extended visas to breach the 90/180 rule.
Now we get to enforcement of EU/Schengen rules. EU's position is that it is for Nation States, not the EU, to enforce and fix penalties for breaches.
Obviously France and Portugal will not penalise a person for exceeding 90/180 when they hold a 180 day visa, but what will other countries do? Will they recognise the 180 day visa as exempting a holder for that period from the 90/180 rule and deem the 90/180 clock starts after that visa expiry date?
Thee are other complications brought about by the decision to issue visas which are not limited to one Nation State.
I think the issues are probably giving immigration authorities in several a few problems to solve. They might also want to form a united front on the issues but may find it hard to agree on one.
Then thee is the matter of training immigration personnel on the rules to be applied at their borders. This gets more complicated because there are EU Members that have territories within their jurisdiction which are not subject to EU/Schengen rules, e.g. France's oversees territories and even Norway's Svarlbad. Therefore there will be complex training needed, a big task.
My personal opinion is that the complications arising from having three parties involved in formulating how the different rules should be applied, together with the view of each Nation State and its implementation/training for policing the rules will make it difficult for them to enforce them.
I can foresee, at least in the near term, a very lax approach to how to deal with the situation.
We have already had some examples on this thread where apparent or potential breaches of the rules have not been pursued
by border officers.