No reason to get so worked up. Santos Dumont / Jersey etc. are all not at an altitude of 510m.
A simple fact is that the Airbus A320 has been around for 30 years, but there has never been a regular service by that type to/from Berne. And the only B737-800s that have ever served Berne were BBJ2s with a handful of people on board.
More importantly, I think we are discussing if there are niche markets for which the E170/190 has a competitive edge over 150/180 seaters operated by LCCs. And I think Berne is an example. Not everywhere where you can technically dump a larger aircraft in the runway does it make sense.