system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] Why does the TARDIS always get wrecked when the Doctor regenerates? Surely the Time Lords would have anticipated this event happening and built the TARDIS to be able to resist damage from it?
gpt
Something seems to have changed the Doctor since the Time War.  He used to have nice, peaceful regenerations.  None of this spraying of regeneration energy everywhere.

Perhaps...  The Time Lords once gave the Master extra regenerations.  Maybe there is a source of regeneration energy that used to be spread among all of the Time Lords, and now it's all focused just on the Doctor.