Is max heat capacity good?

Depends on the build.

• It is great for drone, ECM and shield builds.
• Certain barriers vent heat if you time the activation perfectly, like a parry.
• Hulls range from 425 to 577.5 GJ. When heat reaches the top, the reactor SCRAMs: a control rod burns and the ship shuts down for 3 seconds.
• Many modules work better while heat sits in the Optimal zone (30% to 70% of max heat), e.g. repairers' cycle time is 25% shorter.

Modules that add it: Coolant Reservoir (+15%), Control Relay (+17%, plus drone speed), Adaptive Ward (+8%, plus barrier HP and regen).