Comment by pfdietz

If reaching a sufficiently high triple product were enough, I'd agree with you.

But at some point the problem becomes not one of plasma physics, but of engineering and economics. Regardless of the plasma physics, the walls of the reactor can withstand only so much power/area and only so much cumulative neutron irradiation. Issues like this seem mundane and therefore easy, but they're perfectly capable of rendering a technology into a nonstarter.