That's... not true at all? Nickserv and Chanserv are essential parts of modern IRC and in practice people need a consistent identity to interact with most channels.
Most? Essential? Not really. I can hop into most of the channels with a different nick every time. Nobody cares. I can even use the same one without registering it as long as nobody else does that. I can open a chan without being registered and enforce rules in there.
The only time I need to register something is when I want to keep the channel alive and still be OP when I come back, when I want to keep my nick or when the chan owner requires me to register.
The only time I need to register something is when I want to keep the channel alive and still be OP when I come back, when I want to keep my nick or when the chan owner requires me to register.
Which is all not "most channels".