The build scales well with levels as one gets more accuracy from items/proficiency and more attacks with Extra Attack. AC doesn't really get that much higher as the levels go up. Also JP relied a bit too much on the high roll factor. While hand x-bow is only d6, it's only 1 less in average than a regular 1 handed weapon attack. 3 attacks in a turn is pretty good at range. Enoch really never got to use the full range of his attacks. But yeah, if one wants big numbers for real, just play a paladin and smite everything that moves.
Grappling in general is stupid in 5e. Grappling and tossing people from ledges is too easy. While the concept of dragging someone in a Spike Growth sounds amazing, it's really hard to pull off and if you miss the grapple, you have done nothing for multiple turns. I kinda would also say that the movement is also halved twice, as grappling haves movement and same goes for difficult terrain. If the target is not being moved in difficult terrain, it sure isn't taking that damage. Even if one manages to move the enemy 8 x 5ft it would still be only average of 40 damage. Doesn't really sound that good for a high risk maneuver from mid level character.
Just as a benchmark a level 5 paladin with polearm master can make 3 attacks a turn (2+1 bonus) so max of 8d8 from smites and 2d10+d4 from the weapon and 3 x str modifier. With meager 16 str (+3) one can average around 58 damage in one turn. While this won't be sustainable for long and requires hitting, paladin can easily gain advantage from Vengeance and could actually use hunters mark. Hunters mark bumps the average to 69. You can also have Two Handed fighting style for boot. Rare things beat paladins in pure damage, but as it usually goes, it isn't always easy to get in to the situation where you can do your thing if you only do one limited thing.
Baldur was pretty much this and he was a mean wrecking machine. He even used Great Weapon Master to get +10 damage and the -5 to hit got negated pretty well with the advantage from vengeance paladin channel divinity.