Personally, I don't worry too much about seat tube angle as it's usually easy enough to achieve my preferred saddle setback with a combination of saddle rail adjustment and seatpost setback. My current road bike has a neat flippable seat clamp which changes the seatpost setback between 13 and 25 mm.
Besides I haven't seen much variation in STA across a load of bikes I've looked at recently. They are invariably 73-73.5 deg in my size. I did see one outlier with a slacker 72.5, but it was specifically designed around an integrated zero offset seatpost.