If the Force encompasses everything in Star Wars, why is there a limit to how much energy a being can draw upon for TK?

For example, why can't Luke casually pull down star destroyers, or shift mountains, or devastate continents? We've already seen that Force users can reach planetary level in different ways (e.g. telepathy and Force drain), so what makes telekinesis so different?

Because people can only be BOUND AND PENETRATED by the force for a limited amount of time

So the Force turns people into Ant?

because TK has a constant resistance to it? things have weight and friction and gravity, and inertia, etc. TP is literally limited to how skilled u are, how good ur connection is, if ur opponent is a force user or not, or if he is either more skilled or stronger than u.

Drain is even less wonky. we havent really even seen a limit to drain. technically speaking, people can drain forever, since it makes them stronger the more they drain. it prolly has to do with skill and how much ur victim can fight back, if at all.

There's a limit to how much Force energy a body's midichlorians can channel, and how much energy the body itself can withstand (which is likely linked to the midichlorian count). There's also a limit to the skill, mastery, concentration, etc. of the user.

The Force encompassing everything doesn't imply that individual actors don't have limits.

I honestly don't think the lore gives a great answer for this, because TK is altering the environment around the user. Intuitively it's not as if, like Lightning, energy is bursting forth from the users body. TK seems more like TP.

I would posit that TK is an expression of the user's will on the external environment, and so the greater the alteration they wish to make, the greater strain is placed upon them, the greater their expression of willpower. It's sort of like gravity. If you imagine the Force as the ultimate source of gravity, every Force user is sort of like a black hole with sentience, and they can use their own force of gravity to shape what is around them. But if the internal pressure becomes too great, the force of gravity becomes too dense to contain itself, it implodes. Kind of a butchering of physics but I hope that made some kind of sense.

^ it's possible that the same general mechanism which converts one's will to Tk also converts one's will to lightning (except that the latter is more likely to be a dark side ability), even if the TK is manifesting in another location while lightning is manifesting on one's fingertips or whatever. I don't think there's necessarily a distinction in terms of affecting the user vs. the environment from the standpoint of the midichlorians interacting with the Force.

It's possible that there's some sort of "activation energy" that is required to shape Force energies, and that energy is supplied by the midichlorians. The Force may encompass everything, but that doesn't suggest that using it is effortless any more than a boat in the ocean can suddenly shape the water in any arbitrary way.

The activation energy is an intriguing idea.