For certain definitions of 'high-end', maybe. You've been able to configure workstation-class laptops with 64 gb for a few years now.
And most mid- high-end laptops will happily accept 32GB, again going back a few years.
(Broadwell removed the density limitation that made 16GB DIMMs a no-go; anything that takes DDR4 should support 16GB SODIMMs, excepting the very low end Atom, Celeron etc.)
