Because in many countries you can’t commit suicide with your family sitting by your bed. They will be charged for that.

A dignified assisted death means you end your life on your terms.

Anybody anywhere can commit suicide with varying success and aftermath. Having a clean, sure to work, painless death if you wish it so is a huge improvement over those self made options.

By improvement you mean lower cost and easier availability?

I wouldn't call suicide an improvement over proper treatment or social help. And we're not talking a terminal case here.