Why one Incomparable carrier would not be enough

How useful would an Incomparable-class hull be if converted into an aircraft carrier?

Very useful for speed and air-group size, but the navy would need at least two and preferably three.

The enormous hull promises speed and a very large air group. Force numbers still matter: a unique carrier is an interesting asset, while a class can sustain training, maintenance and deployment. Converting two or three related battlecruiser hulls could replace the Courageous and Glorious conversions. Spectacular ship design only becomes a durable capability when enough hulls exist for repeatable availability.