Really a lot of that just has to do with how long the show's been around, though. Like... just take the Daleks for example. If you were to watch the very first Dalek episode, they are so weak compared to the Daleks we know today that it's kind of hilarious. But then every time the Doctor defeated them, the writers had to eliminate whatever flaw he took advantage of before so that they could remain formidable, and then, fifty years later... yeah.
Similarly the sonic screwdriver was originally an ACTUAL SCREWDRIVER but as the episodes went on they were kind of like "oh and it can also do this, and this, and this..." until we got the pocket deus ex machina that we have today.
But yeah, I mean, it makes sense to tone down what each Fandom is capable of in the RP. I even kind of posted a rule about that in the OP, even using Doctor Who as an example, as he could use the TARDIS for a ridiculous number of things but doesn't because it would kind of break the RP.