I think that's... Mostly that.
Another point is how engineering has progressed during the 20th century.
Nowadays, industrial steel has reached such a level of precision that it's
borderline ridiculous
Honing a modern c135 razor is, after the third, a no brainer : they hone the absolutely same.
No need to feel, no need to adjust, no need for elaborate tricks (swipes, rolling X for the smiles, etc). You have a working protocol ? Just go that way, it will absolutely always work.
Now vintage steel... Are we talking pre-WWII ? Post war ? Because believe me, some have been excessively creative post war since a lot of the good steel was buried in the ground, stuck in the walls, or just rotting outside. Solingen is kind of (big kind of) the exception.
And yet... While there might be a quality standard, they did not have the tools we have nowadays, such as spectrometers, diffractometers, electronic microscopes etc. So well...Quality standards at that time were not the ones we have nowadays, so you have much more variation the older you go.
My advice, if any is needed is as follow:
In the lockpicking world, they have a saying : "Never pick the same lock twice".
Your hand might need to be tried at a wider variety of steels, shapes, provenances, temperings, etc.
After some time, you might feel that vintage and modern Solingen are not
that different