Maybe I am mis-stating the function of the BMS (just sharing what WFCO is saying), but the battery does stop accepting a charge more abruptly than a lead acid battery, and that difference is what the auto detect converter circuitry senses.
I tried to describe this in my post. They have different voltage and current behavior than lead acid, but the end points are very similar... 10.5-14.4V total operating range.
Lead acid typically charges at 0.1-0.2C. C = capacity, so a 100Ah battery is optimally charged at 10-20A. At this rate, they are at about 80% when 14.4V is hit and it takes about 4 hours to achieve 100% SoC with about 15% loss (you put about 15% more back in than you take out).
LFP batteries typically can be charged at 0.5C or 50A on a 100Ah battery.
At 50A, the Voltage stays relatively constant until nearly the end where it shoots up rapidly to 14.4V. In order to top it off, it may need to dwell here for 30 minute to hit full charge with very little loss.
If charged at a lower current, like 0.1-0.2C, the ramp up at the end is even faster, and it requires little to no time to top off.
To boil it down to a general comparison, which supports your general statement, Lead acid batteries need about 4h at absorption voltage to fully charge. LFP batteries rarely require more than 30 minutes.