I think there was an effort in the past to make sure it’s a family show and disconnect The Doctor from the more mature parts of the whoniverse. Maybe the changes in production and, maybe, the realization adults are too obsessed with it create new avenues for money making creativity.
It’s a family show so it’s always kept ‘kid friendly’, but that doesn’t mean it can’t be scary. I remember watching as a kid with a pillow to hide behind when the monsters came.