Can the cost of repairing a kitchen knife be the same as the cost of repairing a lightsaber?
Even after his strength had increased, the quality of his Life Force would also increase, but this increase still couldn't overshadow the speed of the 'repair' cost increase. However, the improvement of the Life Force discharge coefficient could press down this cost.
This was just the physical manifestation, the impact on other aspects was even more direct, such as the use of Life Power... which was equivalent to the glow and heat emitted by Life Force, not that using Life Power would consume Life Force.
There's a rejuvenation technique in magic that involves Life Power and can accelerate the recovery speed of injuries in living organisms. Zheng Yichen, having a higher Life Force discharge coefficient, would see a significant increase in the potency of this magic when he used it.