Child classes have no access to parent attributes unless there are (public) accessor methods for them.

That does not make any sense to the way i do OO. Often enough, i write a base class which does the basics, like for instance, handling a websocket. Then i subclass this and override the empty methods in the base class i need to handle this specific websocket connection. I would still need access to all the stuff in the base class. Yes, technically, i could write accessors, but the would just bloat the code and make it slower. It wouldn't provide any benefits that i can see.

In fact, it might be contraproductive to provide public methods to access the internals in some cases. I might want to give the child classes the ability to fiddle with internal settings of the websocket, but not provide the object creator (? i mean the object that called new()) the same kind of access.