T200 design lifetime question

The T200 doesn’t have a design lifetime listed, but the M200 is stated as three years or 300 cycles to full depth (*to inform testing and not a warranty). Fair enough, the motor is the complicated part of the thruster.

I accept the non-warranty caveat, and am interested in asking about the cycle to depth figure. Is there a particular failure mechanism behind this and is there anything I can do to increase the cycle count?

Is it driven by very deep dives specifically or the repeated changes in pressure? Does diving to half depth make a lot of difference or not much?

Do all the rest of the typical parts (pressure vessels, penetrators, depth sensors) have a similar cycle count?

Thanks