Long pressing is the equivalent of a right-click or shift-click, it's a well-established pattern. MacOS tried to avoid right-clicks for the longest time, but often there's just not enough space to have every feature discoverable by visuals alone.

Of course, hiding everything behind that is not good, but when I look at apps like FairMail that try to show you what you can do directly, it just gets very confusing and the space left for the actual content becomes miniscule.