To add my use case, I often send money to Swiss bank accounts (as I live in Switzerland). Would be very useful to be able to say "send 100 CHF", this is converted on Bunq's side and then sent.
Not because I'm unsatisfied with conversion rates, but rather because often if I send 100 EUR it ends up as more than 100 CHF on the other side, even though they should be receiving exactly 100 CHF, this causes problems on the other side, especially on the side of if they're taxed on whatever it is I'm sending them.