A six column table is unusable on mobile. Options

Either let it scroll horizontally inside a container with a visible edge fade, or restructure into cards below a breakpoint. Hiding columns is the tempting third option and the one people regret, because the hidden column is always the one someone needed.

On hover, yes, and it is nearly free: by the time the click lands the document is often already there. Prefetching everything visible is the version that burns other people's data plan for a marginal gain.