No problem .. good honest question
I'll try to explain this as best as possible , bike angles arnt as black and white as most marketing makes them out to be .
There are many variables such as axle to crown height , HA , B/B drop that can effect the way similar angles can make a bike completely different .
You are correct that you dont manuel sitting down , but you need to look beyond riding style and more toward how your body weight is positioned on the bicycle frame and how the angles of the frame distribute your weight over the two wheels .
The seat angle dictates were you body weight is positioned over the rear wheel and were the rear triangle is measured from .
Then you have B/B height of ground in relation to rear axle drop and this angle dictates how much leverage your frame can develop toward the rear axle .
Now both top tube leangh and head angle along with handle bar posistion are one of the biggest variables in this situation also .
Which give a better levrage point , short toptube with slack HA or longer Toptube with steeper HA ... these again are vaiables that differ per frame manufactor .
This is were axle to crown height come in to play , some bikes have measured axle to crowns as high as 520mm and some as low as 450mm .
Some builders will make their bikes with absurdly high axle to corwns and extreamly slack HA's only to raise the rear alxe drop up to 19mm + so when a 450mm fork is put ont he bike the HA will effectlvly be back down to 71
A bike with a shorter rear end with effectively almost 0.0 B/B drop and a steep seat angle 71+ will feel small but also be harder to get off the ground due to the B/b height relative to the axle to crown and the HA . Effectively making your body weight ride more toward the center of your front triangle keeping your body weight centered .
Our frame have a slightly longer rear end with the slacker seat-tube , effectively putting more of your body mass over the rear triangle , this mated with a steeper HA keep the bike frame stable .
The longer chain-stays give you more leverage and the B/B drop gives you a better starting leverage point .
IE: picture your chain-stay as a lever (chain-stay ) , now basic physics tell us that a shorter lever with pivot point ( B/B ) closer to the actuation point will make it hard to move said lever .
IE: bunnyhopping motion
Now picture the same lever slightly longer , with a hight pivot point and longer actuation ratio , this lever ill be easier to move .
It all comes down to basic physics , I hope this sheds some light on your question .
This is were minor differences in frame design and angles can make the biggest differences .
