Monks are the ONLY class that relies on raw stats for skills. Casters have magic to supplement. Rogue, Ranger, Bard, Artificer have Expertise. Barbarians have Primal Knowledge and Fighters have Tactical Mind. Paladins are the closest to the monk's situation, but they're still half-casters, with all that implies, with Detect / Locate X and Command magics at minimum, and their steeds as pseudo-familiars.
Meanwhile, walking on water, the closest thing to an exploration feature of the Monk, is a level 9 feature. That's end game for 95% of games, and doesn't see play a lot at this point, especially when most water walking needs the entire party to pass, not just one person. So, no, its not really a niche if its super rare.
Assuming you can drag enemies. That still butts up against Carrying Capacity rules, which require strength. Ignore them if you wish at your table, but they're not RAW and ignoring the rules is not consistent across tables. And, frankly, making multiple unarmed attacks to push/shove/etc is something everyone can do. Its just that the monk gets to do them for the first time. That's not making them special, its bringing them up to the basic level everyone else is already at.
Plus? Other martials have weapon masteries now. So, they're pushing, tripping, etc as a part of their normal damage. The monk is not. The monk can do one or the other while fighters, barbarians and paladins are doing both at once.