I also operated both types at flybe and the only reason the Dash isn't much slower than the Embraer is the Embraer is, or was, flown at LRC to make the fuel burn comparable to the Dash because it was such a good decision to lease the expensive Sao Paolo Sewer Pipe in the first place.
The 175 and 195 were originally planned to be steep approach certified at the same time as the 0's but ultimately they weren't.
S1E, I think you've been misled, it's not down to runway performance in the Embraer case.