please study IPv6 and how it works before making wild posts. IPv6 while similar is much better thought over than IPv4 is.
First of, on IPv6 network infrastructure you are not required to have global Ipv6 addresses at all. Only the network with end user hosts and interfaces connected to that network should have an IPv6 address, IPv6 address can be used for management only. All the networking stuff will and can happen using Link-local addresses.
The address you get will be Prefix + MAC address with the “usual” parts added to comply with EUI64.
Yes, there is some technical issues why RouterOS does not show this address in the address list.
Also, IPv6 has redirect message that end user hosts has to obey if received - that is, if network infrastructure knows a better route to the host via another router in the same network, it can send the redirect to the end user host. After that, the end user host has to send all the traffic using gateway as indicated in redirect host.