I think charging at 1C always needs temperature protection. Maybe there is a new type of particular lithium battery that doesn’t need temperature monitoring when charged at 1C…I think bosch use it in their drills, but I cant remember the name of it, its something like lithium polymer or something.
I would monitor the temperature, and looking at page 15 of the battery datasheet, you should stop charging if the cell temperature goes above 80degC. I think a sudden sharp rise in temperature in any case, is a sign that a lithium cell being charged is fully charged.
I am pretty sure that when the cell is quite depleted, it doesn’t really heat up much at all when charged at 1C…but if you keep on pumping in 1C when a cell gets full, then it can overheat very quickly.
I suppose to be safe you have to monitor the temperature of each cell.
I know what you mean though, finding out the exact charging requirements of particular batteries is very challenging….unless you have orders in the 100,s of thouands and the battery manufacturer is then always at your side.