Merge a Nuke rebirth should be considered when the permanent benefit is worth the reset and you can recover quickly. If one upgrade or merge would shorten recovery, waiting may be better.
The rebirth question
Merge a Nuke rebirth decisions should compare permanent gain with recovery time. A reset that gives long-term value can still be bad if it happens too early. A reset that feels costly can be correct if your current base is stalling.
When to wait
Wait if a near-term upgrade would make the next run faster, if your board is close to a higher-value nuke, or if you do not understand what will reset. Waiting is also reasonable when exact requirements are unclear after an update.
When to rebirth
Consider rebirth when your progress has slowed, the next permanent gain is clear, and your return path is short. A good Merge a Nuke rebirth should make the next cycle easier, not simply reset because a button is available.
Verification boundary
Exact rebirth requirements and bonus values should be checked in game. This page explains the decision model until verified tables are ready.