@atpfm I somehow hit the jackpot on our house; the garage had full patch panels for cat5, phone, and coax. Every single room has at least 2x cat5, 1x rj11, 1x coax run. It's been absolutely marvelous to just plug and play all my networking stuff in the garage and get PoE all the places. It was done in 2002 so it's just starting to show its age -- it can only push 2.5Gbps, but that's fine because while all of my garage wiring is 10gig, the only device in the house that can use more than 2.5 is my Mac Studio.

I definitely echo your comments on power, though. Seemingly simple things ("upgrade the service") can be vexingly complex. Waiting ages for your utility to actually run the service you need. Dealing with the panel upgrade. In my case, our panel is on a wall that is now over a setback. So upgrading from 200A service to 400A service would have cost us $35k+ to basically move EVERYTHING.
Don't ask why 200A is constraining us. Small bay area house, no A/C today. But, I have a 60A circuit for the EV charger, and we're looking at going to an electric heat pump, adding a hot tub, and.. well, it adds up, huh? The smart panel is a GREAT way to avoid having to go 400A.

@siracusa is right, "just let me decide which things to run at once" but the electrical code doesn't agree. If the load calcs don't support what you're doing, you can't do it. It's an easy sacrifice to say "Yeah, drop the power to the hot tub if for some reason we're charging the car at 3am and also running an induction stove and the air fryer and the air conditioning”.