Elliot, adapting to his new gear, was pacing around the warehouse with Alina, his bodyguard, never leaving his side.
"Doesn't feel much different with or without the gear; your modifications are really conservative."
"...Too much enhancement places a heavy burden on the body. Being clear-headed is far more important than fighting skills... Can anyone fight against a united force?"
Besides, a potential reason is that Elliot's physical fitness is rather poor, especially with a very high fat content.
Advanced prosthetics, particularly the high-grade fourth generation ones, are extremely sensitive to neural currents but also affect other parts of the body. Fat in the body can compress the prosthetics and interfere with the enhanced bioelectric currents...
In other words, people with excess weight need to be more conservative in choosing prosthetics.