>The calculations aren’t as simple as summing watts though, especially with 3-phase feeds — Cloudflare has a great blogpost covering this topic.

What's written in the Cloudflare blogpost linked in the article holds true only of you can use a Delta config (as done in the US to obtain 208V) as opposed to the Wye config used in Europe. The latter does not give a substantial advantage: no sqrt(3) boost to power distribution efficiency and you end up adding Watts for three independent single phase circuits (cfr. https://en.m.wikipedia.org/wiki/Three-phase_electric_power).

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