The problem with bunq referring to the API is that although it is very nice to have an actual API, the gross part of users don't know what to do with an API.
I for instance have some experience with programming in Visual Basic (VBS/VBA) but not much on other programming languages such as Phyton or C++ or Swift.
Nor do I have the time to read in on those languages. At bunq there are many programmers who have the proper language skills and knowledge of the bunq infra structure.
All I know from my experience is that 'if ... then do'-structures are one of the most basic structures in programming. The basics of such a feature would be within my skillset. But offering a user interface with the possibility to choose variables and communicating with the bunq-app is far beyond my skills.
This is where the programmers at bunq are way more experienced than I am, as a matter of fact, most users are. It would take bunq much less effort to build such a feature for its growing community.
So why not build this, as many users want this and it is quite straight forward for you guys?