I suppose only for dudes like you with plenty of cash to buy the latest off-the-shelf bling bikes.

But some of us also are into older bikes for which the manufacturers' measurements have disappeared off the net.

There also is some degree of confusion or disagreement over how frames should be measured, especially with the advent of compact frames. There then needs to be, in our case, a standardised form of measuring the notional top tube and seat tube lengths, especially as the "base data" bikes had or have frames with level or almost level top tubes.

There is a tendency for some published measurements by manufacturers to blur the method of measuring the top and seat tubes.