That's just silly, paying 700 euros for a motherboard just because it has useless 10Gbps LAN, when a 10Gbps add-in card is 50$.
Buying a MSI Unify is a good choice, though, simply because it looks like the OP has an MSI video card, so syncing all the RGB with one software is safer and easier. That is the only reason to go MSI, really, since there is nothing fantastic about that VRM, it's regular VRM for a Z490, nothing special or great about it.
The rest of your advice follows the same trend, it seems. Stupid fast DDR4 on Intel gives you very little advantage for very much trouble in running it as intended, and for quite a price increase.
Also, D15>>>U12A, and I mean...much. It also looks nicer in the chromax.black variant. Don't let the reviews fool you, the D15 can actually keep the fans at 20-40% PWM in most gaming and regular usage scenarios, almost inaudible, while the U12A ...not so much.
The TX750 PSU is not as quiet as you might imagine, when the fan spins up, randomly, for no reason, it's annoyingly loud. That being said, all modern decent PSUs have zeroRPM funtion, so ... yeah, any GOld or Platinum PSU will do without braking the bank going for Titanium.