I don't use CLOS or EIEIO very often but when I do, I remove methods all
the time.  I thus think it's a very important part of CLOS worflow.
SLIME inspector (for Common Lisp) offers buttons that remove methods on
the gf's page, e.g.:

Name: PRINT-OBJECT
Arguments: (SB-PCL::OBJECT STREAM)
Method class: #<STANDARD-CLASS COMMON-LISP:STANDARD-METHOD>
Method combination: #<SB-PCL::STANDARD-METHOD-COMBINATION STANDARD () {10002158A3}>
Methods: 
(TRACE-ENTRY T) [remove method]
(UNREADABLE-RESULT T) [remove method]
(CHANNEL T) [remove method]
(CONNECTION T) [remove method]
...

[remove method] are buttons.  Sadly, Elisp doesn't have an inspector but
I've heard of one effort github.com/mmontone/emacs-inspector and anyway,
these buttons would be appropriate in any displayed list of methods,
including the list currently shown in *Help* buffer for the gf.

Example:

Implementations:

[remove] :around (object stream) in ‘cl-print.el’.

Undocumented

[remove] ((object string) stream) in ‘cl-print.el’.

...


Recently it became necessary to use cl-remove-method in a library code
so I tried to write it.

The following seems to work but I'm very far from being confident about
it.  Also, methods are cached in lambdas returned by lambdas returned by
cl--generic-get-dispatcher, and I haven't yet figured out a way to get
them out of there; I'm also not sure if they should be removed manually,
or the tables will just get GC'ed given the proposed implementation of
cl-remove-method as is.