Yes, but don't forget....
Yes, I generally agree. Due to generous freebore dimensions, lots of common (especially US-made) autos will accept and safely shoot rounds longer than the SAAMI max COL, but....
1) In MOST common autos, the maximum feasible COL ends up being set by the magazine. While the chamber might accept a single cartridge longer than the SAAMI max cartridge length, multiple rounds of longer than normal length can't be loaded into the mag and therefore make exceeding the SAAMI COL numbers a mute point.
2) There ARE some pistols out there with exceedingly short freebore dimensions, CZ pistols being one of these. It is for pistols such as these that manufacturers sometimes set the COL shorter than the SAAMI max COL. This would especially be the case when loading bullets that bring the full barrel diameter closer to the nose of the bullet, such as FP target bullets, or conical nose HP bullets.
So it is the bullet's ogive shape that effectively determines the COL in any pistol.
Hope this helps!