The headcount is what will put pressure on the politicians and not the AUM of foreigners who do not even speak local languages in most cases.
That is clearly given with Swissqoute (Other local banks use them for being their trading agent as well either thru whitelabel or by being open about it).
For the same reasoning, Credit Suisse can be a good option. It is heavily used as well
Many look for lower fees as the other banks charges are outrageous and can be 100$ for just a simple buy of Singtel for 2k or so, that is why SQ is so popular.
You should never need their support anyway, but after all they are a discount broker (dirt cheap compared to other banks there charging a fortune or custody fees for simply having $ with them) so you cannot expect top notch support and hand holding.
I have a bunch of brokerages on different continents and not once did I ever use their support.
That being said, Europe is not US and stocks and capital markets are not even closely as popular as in the US. Most in Europe hold stocks only thru their pension plans (which does not report and list performance of stocks on a frequent basis) and many people do not even know they hold stocks indirectly thru these pension vehicles as it is presented similar to a tax.