Oeh Delphi! That brings back some memories. But I hear what you're saying. I must say front-end has become more mature, but still, it can be quite frustrating so now and then.

More moving part is the right way to say it I guess. And perhaps: you have a user which interacts with it, so there is a lot to keep in mind regarding that as well: show loaders, what happens with y if they hit x and z, etc.