However, as anyone familiar with the principles of good object-oriented programming practices knows, directly accessing the slots (or fields or member variables) of an object can lead to fragile code.

For instance, money-market-account will inherit slots and behaviors for dealing with checks from checking-account and slots and behaviors for computing interest from savings-account. Likewise, any method that's applicable to any class in the class precedence list will be applicable to a money-market-account object.
To see how this works, let's add a class to the banking app: money-market-account. If you don't see it, please check your junk folder. Before leaving the machine, check the receipt carefully to make sure that it accurately reflects the total amount of your coins. However, before you start dumping your coins into the machine, there are a few tips that can help you maximize your payout and make the most of your time.
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Which one is right? I'll discuss in the section "Multiple Inheritance" what it means to list more than one direct superclass in direct-superclass-names. Note how this list satisfies both rules: every class appears before all its superclasses, and checking-account and savings-account appear in the order specified in DEFCLASS.
The bulk of a DEFCLASS form consists of the list of slot specifiers. Common Lisp resolves these situations by merging all the specifiers with the same name from the new class and all its superclasses to create a single specifier for each unique slot name. Then a method specializing its single argument on the new class and returning the value of the slot is added to the generic function. They live in their own section of the class hierarchy, arranged into appropriate sub- and superclass relationships, and are manipulated by the functions I've been discussing for much of the book up until now.

But the classes it creates are fairly limited compared to DEFCLASSed classes.

The choice of whether to use WITH-SLOTS versus WITH-ACCESSORS is the same as the choice between SLOT-VALUE and an accessor function: low-level code that provides the basic functionality of a class may use SLOT-VALUE or WITH-SLOTS to directly manipulate slots in ways not supported by accessor functions or to explicitly avoid the effects of auxiliary methods that may have been defined on the accessor functions.
WITH-SLOTS provides direct access to the slots, as if by SLOT-VALUE, while WITH-ACCESSORS provides a shorthand for accessor methods. The form of WITH-ACCESSORS is the same as WITH-SLOTS except each element of the slot list is a two-item list containing a variable name and the name of an accessor function. However, :class slots are accessed the same as :instance slots--they're accessed with SLOT-VALUE or an accessor function, which means you can access the slot value only through an instance of the class even though it isn't actually stored in the instance.

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