. . . . I have yet to see any single 18650 SST-50 advertised as driven above 2500mA, or I would consider upgrading from my 2.5A MC-E flashlights.
The big advantage of replacing an MC-E/P7 with an SST-50 - without increasing the drive current - is to get rid of the black cross caused by having 4 separate chips.
There may be an increase in Lumens due to mproved chip efficiency.