The Magical Idealized Land of Physics

If you stick around in physics long enough, you'll realize that most of what physicists say doesn't work in the real world.  Or rather, most of it isn't exactly right, though "exactly" can mean anything from, "to within a micron or so," to, "unless we're talking about someplace with air."  Even the things which are good enough for everyday use in the real world aren't quite right because to make them account for complications would make them unusably complicated.

So if you're never going to fly a spaceship while trying to boil an egg back on Earth, you can usually get by with The Magical Idealized Land of Physics™ or The MILP as I shall henceforth refer to it.

In The MILP, anything that we don't care about doesn't happen.  Unless we're talking about Relativity (and if we are, we're probably ignoring other things) The MILP doesn't experience relativistic effects; no time dillation, a fixed point of reference (usually the observer of whatever it is we're talking about), no General Relativity at all.  Unless we're talking about friction, there's usually no friction, and if there is, it's only the type of friction we care about.  Cosmic constants stay constant even if we're not at sea level (believe it or not, gravity affects you slightly less on Mt. Everest than it does at the bottom of the Mariana Trench).

So, unless a physicist says otherwise, they're usually talking about The MILP.

And this is a good thing.  Because without The MILP, I couldn't talk to you about physics because I wouldn't understand it, or I would have invented The MILP for myself just so I could reduce the complications down to a point where I could understand things.  The MILP makes it possible to talk about the real world without dealing with all the crap the real world wants to throw at you.  All scientists use some kind of MIL, be it the MILB for biology or the MILC for chemistry, etc.

This has implications to philosophy too: it turns out that the only way to represent a thing completely is with the thing itself.  And if all you can do to explain the world is to point and say, "There's my explanation," any time anyone asks you for a reason, that's not terribly helpful.

So embrace The MILP™ because it's the only way to talk about anything.