Closures upon closures is not intrinsically easier or harder to keep organized than subclasses upon subclasses.
They just organize naturally in different ways. If a clean OO model fits your problem, then OO naturally channels you. If it doesn't, then using closures is better than trying to fight OO into an imitation of what you would do more naturally with closures. Particularly so in Perl where writing any OO involves so much infrastructure.
BTW your extra method-call hooks could be replaced with a single method that is intended to be called from subclasses with SUPER. Less code and infrastructure, same result.
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