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ST angle doesn’t really have a bearing on anything fit-wise, your saddle position is still set in relation to the BB.
This.
The only thing ST angle is important is for those who need the saddle further/nearer to the BB, which can be remedy by simply looking at the seat angle and Reach together.
I’m guessing TT measurement for sizing is basically a throw back to when all road frames were horizontal TT and 73/73, which then got carried over as “ETT” when compact frames came in, but as geometry has evolved it’s no longer that simple.
Zing.
edscoble
But a bike fit centres around the BB. Your saddle position is fixed in relation to the BB, which is why reach and stack are a better metric for frame sizing.
ST angle doesn’t really have a bearing on anything fit-wise, your saddle position is still set in relation to the BB.
I’m guessing TT measurement for sizing is basically a throw back to when all road frames were horizontal TT and 73/73, which then got carried over as “ETT” when compact frames came in, but as geometry has evolved it’s no longer that simple.