On the first point, just wanted to add a quote from utilitarianism.net that I think vibes well with the argument of the OP:
Even if [different theories of well-being] currently coincide in practice, their differences could become more practically significant as technology advances, and with it, our ability to manipulate our own minds. If we one day face the prospect of engineering our descendants so that they experience bliss in total passivity, it will be important to determine whether we would thereby be doing them a favor, or robbing them of much of what makes for a truly flourishing life.
On the first point, just wanted to add a quote from utilitarianism.net that I think vibes well with the argument of the OP: