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But what you are assuming is that it’s practical to get the seat to the same position (relative to the BB) in all frames. It’s not. Seat tube angle differences can make that impossible without some crazy offset.
Look at the difference in seat tube angle on a marathon XC bike vs a downhill bike. Also notice that the downhill bike has the seat tube not intersecting the BB at all, it’s offset horizontally. Depending on how high you have the seat set in the downhill bike, you will get a big difference in the front to back position of the seat relative to the bars. A lot more than 25mm.
Are a lot of people trying to achieve the same position between a marathon XC and a DH bike?
Does the answer matter? I could have instead said compare the Evil Shamois Haggar (slacked out gravel / drop bar MTB) vs a gravel bike based on road bike geometry. Two bikes in the same category.
The point is, you said only stack and reach matter. That’s not true. You were wrong and you should just admit it.
Let’s take a breath and reset. Points are made and known. Confrontation is not helpful. Horse is dead. Moving on…
Uh, yeah…because it is the difference between actually understanding how S&R works vs. trying to come up with some hypothetical situation that doesn’t exist in the real world.
ETA - sorry, chad, we are cross-posting.