Samsung needs a big hit with the Galaxy S10 in 2019, but while 5G seems like an obvious lure for impatient upgraders, the fledgling next-gen network technology might end up harming more than helping. The Galaxy S10 went, unsurprisingly, unmentioned during Samsung’s CES 2019 keynote this week, though the carrier did discuss its 5G plans. That first Samsung 5G phone, …