Reply To: Technology and the Third Beis Hamikdash

M42: Because he wore the B’gadim the whole time he was in the Mikdash, not just when he was doing the Avodah (this is only the Kohen Gadol). While doing the Avodah he (or any Kohen) wouldn’t wear T’fillin because it would be a Chatzitza, if I recall correctly.