Cat8

Installing cat8 for a new house "just in case", is like installing plumbing for a swimming pool, just in case you want to upgrade your bathtub. It simply doesn't make sense, there's no logical use case for it.

Cat8 is a solution looking for a problem. Too much heat and basically zero reason for anyone to build connectors and devices that support it when fiber is already there. People talk about Cat8 like they are future-proofing or something, but it's entirely wasted. Even at the enterprise level there is essentially zero use for it.

Actual networking hardware that needs anything more than 6A? One report of vapourware right around COVID and actual hardware to purchase? ZERO. Ten years of NOTHING. Faster than 10G over copper is a dead standard. There is no future to proof against.

I’ve considered Cat8 for future-proofing, but I’ve read conflicting reports about it being overkill, too stiff for conduits, and potentially problematic with grounding in home environments.

Avoid anything that says cat7 or cat8 as they will be bogus

Note that there is plenty of cable advertised online as cat7 or cat8 but it is actually cheap garbage.

Also, don't buy cables listed as Cat7 or Cat8, regardless of their price. Many aren't up to spec, and it just isn't worth the hassle.

Don't bother with CAT7 / 8 they're not intended for anything other than server room applications, big waste of money and a lot harder to terminate.