Concur with most of the above.
Although I think Atlas did their best - and had to 'obey' commands - a lack of flexibility at times was quite costly.
On at least one occasion, the '2 hour rule' meant aircraft had to lodge over night at Shoreham in order to return the next day.
For myself, twice coming back through France via Le Touquet, when I did not know my exact ETA there well in advance, it meant that I had to 'hang around' LT for two hours for a flight plan to be lodged since there was no facility for a 'delay' on a plan possible. Good business for the restaurant at LT; but frustrating, none the less.
My real concern would be the curtailment that it did to both GA flying and GA training at a field like Rochester. I sadly await to hear of who, and how many, facilities will declare 'closure' later this year.