R help - Apr 2023 - Creating methods

I am reading Hadley's "Advanced R", Section 13.4.3 
(https://adv-r.hadley.nz/s3.html). It starts

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There are two wrinkles to be aware of when you create a new method:

     First, you should only ever write a method if you own the generic 
or the class. R will allow you to define a method even if you don?t, but 
it is exceedingly bad manners. Instead, work with the author of either 
the generic or the class to add the method in their code.
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I was stunned when I read it. I write methods all over the place for 
generics like print, summary, plot, etc.

So my question is: Do I "own" those generics, or am I just showing bad
manners?

Thanks, G?ran

? Mon, 24 Apr 2023 15:07:50 +0200
G?ran Brostr?m <gb at ehar.se> ?????:
>> First, you should only ever write a method if you own the generic 
>> or the class.
> I was stunned when I read it. I write methods all over the place for 
> generics like print, summary, plot, etc.
You most likely do that for your own classes. It's sufficient to own
either the generic or the class, though owning both wouldn't hurt.

-- 
Best regards,
Ivan