The point of the damage cap?

There's no reason to cap at 19 bit. Of course you can, but there's no reason to. I believe the game just goes commando and caps damage at 999999, possibly to combat hacks.

But I've never seen anyone in the real servers hack their damage to 999999. And even if they did, that degree of damage is broken and unbalanced in its own right.

If there wasn't any sort of damage cap, bosses would fall too easily. With the cap on HP being 2.1 billion, having players do much more than they already do will mean things will just fall apart too easily. I mean, look at Chaos Pink Bean... They can't make it "difficult" enough with 2.1 billion HP, so they have Pink Bean respawn when he dies so it resets the HP count.

The game would require some reworking for those values to be able to be increased. I don't think Nexon Korea cares enough to do that.

That is a valid point, but it's ridiculously difficult and expensive to hit beyond the cap in the first place, isn't it?

Also, IMO, if anyone is opulent enough to spend that much money on potential to the point that they can consistently hit beyond the damage cap on 7 hit skills, they kinda deserve to. But that's just my opinion.