What is the biggest criticism of the Schengen Area? HELP ASAP!

For the Schengen cooperation 2015 was to herald its 30th anniversary, a symbolic stage in its development [1]. As a sign of history this anniversary coincided, give or take a few days, with the start of Luxembourg's six-monthly presidency of the Council of the European Union. Indeed it was in this Member State, in a village on the borders of Germany and France that the Schengen Agreement was signed on 14th June 1985. It seemed that all conditions would be met to celebrate, in all simplicity, given the political and economic context, one of the most important achievements in European integration.

It is the second answer

Ascenario that doesnt  include any modern objects like electricity