You don't appear to have mentioned brakes/shifters, calipers, or rotors, or a battery (not included with a derailleur, usually).
Also, for tt'ing, I'd prioritise closer jumps, so (purely IMO) a 48/35 and a 10-30 setup would make more sense for a TT bike.
The shifters are the blips and it's a TT bike so brakes are separate to the
functional 1 x system
I agree that the 10-36 will feel horrible for racing but each to their own. Good shout about the battery.
@leggy_blonde started
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You don't appear to have mentioned brakes/shifters, calipers, or rotors, or a battery (not included with a derailleur, usually).
Also, for tt'ing, I'd prioritise closer jumps, so (purely IMO) a 48/35 and a 10-30 setup would make more sense for a TT bike.