I take advantage of this on Incursion, when you’re at the last sentry and attacking from the safety of that top room with the healing station. Enemies tend to swarm from both sides and target the healing station over Battleborn (Why not, it’s essentially a stationary Miko) so I try to keep it at level 1 until they start beating on it then upgrade it mid fight. Same goes for the thumper turret that will assault flanking enemies, leave it at level 1 and upgrade it once they’ve damaged it beyond say half health.
Sadly my teammates don’t always understand or agree with this tactic and just end up upgrading them to full. Then they get destroyed and we have to wait for them to cool down before we can build them again, wasting precious time and shards when all we need is to defend against one wave of enemies then assault the turret with a healing station at our backs while the enemy team is on respawn timers.