From the report, the E195 requires Flap 5 selection to assist with the pax getting off the wing. Interestingly the report doesn't recommend any changes to ensure sufficient hydraulic power for long enough to achieve this. In this instance it looks like the crew selected Flaps 5, shut the engines down and the flaps never made it to their selected position.
To be fair 1.8m (the legal requirement) is a big drop when you are considering the whole population... elderly people, disabled, children etc. But I guess it's an emergency egress. The other issue seemed to be that they didn't recognise the markings on the wind directing them backwards. Imagine the confusion if it was a dark and stormy night, howling winds and very slippery wing surface. It's also clear the majority had not read the safety briefing card
- maybe a mandatory quiz before departure for all the pax on evacuation procedures
Looking at other popular narrow bodies, the A318/319/320 has overwing exit slides. (A321 doesn't have overwing exits at all)
The 737 has "flaps 40" as one of the evacuation checklist items I believe in order to meet the 1.8m requirement.