If it helps, doctor who isn’t sci-fi, it’s “sci-fantasy”. None of the tech is ever explained in any way other than sort of the sonic screwdriver, kinda sorta, it just works or doesn’t based on what the show needs.

There’s some vague sci-fi elements to it, but overall it’s pure fantasy. So if that’s not what you are looking for, totally understandable that it wouldn’t be your bag.