Daniel, I tried with a simple piano score reproducing the first three bars of Bach’s first Inventio. No virtual instrument selected. Nothing else than notes, without ornaments or dynamic marks.
Unfortunately, the behavior is the same: tap to click behaves fuzzily. Tap to click is not immediately recognized even in some UI button, or when choosing the Add Single Player command in the Setup page, or when trying to select the Write tab (the others seem to respond immediately).
Out of the Dorico window, everything works fine. Dorico menus are selected immediately. Everything works immediately in the other apps.
@ShikiSuen: Actually, I find having to click as with a mouse very unnatural with a trackpad. I see a trackpad like a tablet: you do everything on a flat surface, without any mechanical part involved (real or simulated).
In any case, we got choices, so we are free to work as we feel more natural.