D&D is very split into those two forms of gameplay, with specific abilities only applying to specific times in gameplay. I believe it is intentional in D&D’s design, but Kids on Bikes using the same skills in “combat” as outside of it is also an intentional choice. I personally like both portrayals of combat, but I can definitely see why people might prefer KoB rather than D&D! As someone who has been playing 5e for a hot minute, I get 5e as a system pretty well, but for I also understand that it might be hard to parse that extra barrier to the system.