Why Courageous returned as a submarine name

Why has the Royal Navy reused Courageous but not Glorious or Furious?

Courageous was reused for a nuclear submarine; the lack of Glorious and Furious is attributed tentatively to modern naming preferences, especially the aggressive sound of Furious.

Courageous returned to Royal Navy service as the name of a nuclear submarine, while Glorious and Furious had not been reused by 2021. The suggested explanation is a change in naming taste rather than any formal ban on the older names. Courageous still sounds acceptable in that climate, whereas Furious can sound unusually aggressive for a modern commission. The answer treats this as an impression of recent naming practice and notes Invincible as an exception, not as evidence of a published policy.