Embraer 195 has leading edge slats.
If landing was No Flaps then Vref would probably be +30 knots or there abouts. If No Flaps and Stats then much faster, maybe +60 kts.
Much longer runway required, at least double, and then tyre limit speed becomes a problem. Most jets have 195.5 kts (225mph) tyres so if normal Vref is around 130kts then no Flaps and Slats gets a bit close to the limit.
The figures I have used are for A300 but most swept wing Airliners have similar numbers regardless of size.
Hope this helps