It's a big part of why so many big name romans fell on their swords on defeat, metaphorically or literally. Self-determination was seen as a bigger virtue than life, and e.g. Cato killing himself was regarded as a way to rob Julius Caesar of ultimate victory, turning him into a sort of martyr for the philosophy.
I am willing to grant them the point that in a hypothetical society where suicide was not taboo, but an mundane and uncontroversial act, a lot of things we consider problems would vanish overnight. Indentured servitude, extortion, social injustice, slavery. All these hinge on a human being having no way out of mistreatment. In such a society, it would be largely impossible to compel anyone to do something against their will.
At first glance, this seems like it would benefit the bullies, but if you think further, you realize they would find themselves completely isolated without allies. The only way to successfully work with other people would be through cooperation.
It's obviously not entirely realistic to have a society that functions this way, but it's arguably an underexplored counterfactual that raises questions regarding who actually benefits from particular taboo.