Which Smash game has, really?
Maybe 'balanced' was the wrong word. What I should have said is that this game is horribly, laughably lopsided. Case in point - Most other bury moves last for days, giving characters with already tons of options even more options and even some free kills. ROB, already a character with fewer options, gets a not-really-bury-bury and maybe, possibly a kill at higher %, but also maybe not because smashes don't buffer well out of throws.
Edit: Just wanted to add without making a new post...
I've had some time to play with the Dthrow in matches, and it's really not reliable or even safe. Characters can start mashing out as soon as they get grabbed, which means that by the time they get buried they can almost instantly pop up and act before ROB's FAF,
making the move truly punishable at anything below 80-100% (Ganondorf's DownB and Dedede's Dair come to mind). Even at 100%, players can mash out so fast as to make Usmash whiff - Dthrow really only true combos into Usmash at around 130% or so, maybe higher. At lesser %, Dthrow is really only useful if you catch an opponent off guard which won't happen if your opponent is trained to mash all grabs. At Kill % it's still a good move for finishing opponents, but not nearly as safe or effective as its previous incarnation.
I just watched Sekai whiff an Usmash on Corrin at 190%. Like holy crap, this move is pathetic.
Edit2:
I was labbing some combos out of Dthrow. If you down-tilt the opponent then it prevents the pop-up animation and has a chance to trip. Dtilt x2 and you can chain grab, which seems to work all the way up to 80-120%, depending on the opponent. While this was horribly fun and has amazing potential, my spirits were crushed when I confirmed that any bit of mashing in the slightest will cause the first Dtilt to miss until such % that it no longer combos into a chain grab, and by then your only options are Uair or Usmash. Unfortunately this will only have any viability against extreme newbies who don't know what mashing is, and feels like a huge waste of potential. However, I recommend you try it in training mode because it's really fun to pull off, even if it doesn't have any viability in match whatsoever.
Final Verdict: No beep-boop, unsafe under 80%, fewer reliable followup options for ROB with MANY options for the opponent, worst bury move in the game, ROB's other throws are much worse = massive nerf