Oh, I don't know... I'm still happy I ran CAT5e and RG6 to every room, I use a fair bit of it too. Sure, I can't run 10GBe on it, well, maybe really short runs, but we know how that goes.. There are still a LOT of things that don't really use 1Gbe, some even connect at 100Mb. I do wish I had dropped fiber in for my office, but that's more because I like to play with it than that I really need it for anything I'm doing. When I did it >10 years back, fiber and CAT6 were stupid expensive. If I were building now, I'd use CAT6 or CAT7. And probably some fiber drops along with places like my office running open conduit. Anything you put in WILL be obsolete eventually, but that doesn't mean it's not useful for some things. I mean, a phone run isn't going to need even 100Mb if it's even digital. Currently, my wiring has analog phone, 100Mbe, 1Gbe, audio, and RS-485 running on it. I've run IR repeaters, HDMI, and a few other things on it using converters.
For power to the rack, do make sure to run a dedicated circuit. Or three. I specced one, but the idiot installing decided I didn't need it and I didn't catch it in time. I ended up running a new one later, but it was in the same room with the breaker box, super easy if somewhat tedious to run. If I have to add more, I'll run conduit so I can expand easily later, but I don't think it will be needed anytime soon.