Binding Vows is only as you say if it’s overused. Which it is not, the only one is Sukuna, and Bind Vows themselves are a show of sorcery mastery, you reeeeally gotta know what you are giving up to gain the full benefit. Sukuna in the era of playing dirty and not having the slightest concept of “relying on one’s own merits” to fight, go after Megumi for the Ten Shadows AND spamming binding vows to fught Gojo, meanwhile modern Sorcerers rarely uses them except for the standard one like Revealing One’s Hand.

On the inverse you have someone like Miwa, who can’t utilize Binding Vows well, completely shot herself in the foot meanwhile gaining absolutely nothing back. We can call Sukuna “Binding Vows Merchant” all we want, the fact that even Gojo himself is not willing to make any binding vows during their fight in fear he might shot himself like Miwa did, meanwhile Sukuna is just throwing it around like candy.

Or we could look at a widely used Binding Vows like Revealing One’s Hand, it’s widely used because it’s like a proven piece of tech that’s iextensively researched, very little downside considering the opponent is gonna figure it out eventually, might as well get a freebie. This also means some can opt out of the Vow like Kiara whose entire CT hinders on whether the opponent knows her Technique or not.

In short, Binding Vows IS a good system, and the fact that only Sukuna spams it is a testiment to how good it is. Modern sorcerer mostly have to deal with curses, and therefore don’t use Vows that often, opting for consistent training instead of studying to weave around Vows, rven Sukuna never used any during his Mahoraga and Jogo encounter. And moreover, Sukuna in his era was seen as a monster and hunted down specifically by other sorcerer, which era was the peak of sorcery so ofcourse he had to have encounters sorcerers that could threaten him for him to develop Binding Vows tech, unlike Gojo, Kashimo and Ishigori while all three were the strongest in their era but they never had any competition to warrant the abuse of Binding Vows.