Certainly a cost/weight penalty.
Also they can't be taken into account for performance calculations so runway has to be long enough to land without them regardless.
Carbon brakes on the ERJ wear far less when hot so one is supposed to brake v.firmly anyway to reduce brake wear. Thrust reversers leading to light brake application will therefore actually increase this brake wear.
All in all a no win situation (Unless the brakes fail, along with the accumulator pressure and the emergency/parking brakes too - but then why stop there, why not have parachutes and anchors in case the reversers fail.....
)