Realforce imlemented feature called kill switch where inputting D cancels A so you move right and instantly go back to moving left when D is released. Static delay with a+d active at the same time is eliminated.
Its also easily doable in qmk, ive made snippet for my previous keychron keyboard (can share).
Rapid trigger covers most of this but still would be nice, especially if user tend to fat finger a+d active at the same time.