If you think IPv6 is too complicated, you are either overestimating IPv6’s complexity or underestimating IPv4’s complexity. IPv6 is undeniably simpler. It has a cleaner header format that is simpler to parse, it has no need for on-path routers to perform fragmentation, it combines host/router discovery and various diagnostic control packets down into a single protocol called ICMPv6, it has stateless address autoconfiguration and correct link-local address behaviours amongst others. It fixes decades of mistakes that have accumulated in IPv4.