What is the purpose of subnets and VLANs in IPv6?

So im implementing my first IPv6 network, only 40 hosts for a small company, divided into 4 departments. Now with Ipv4 I would have put each deparment on its own subnet and VLAN in order to reduce broadcasts and simplify security with ACLs, but as IPv6 doesnt use broadcasts, this now seems pointless to me. But wouldnt this make it difficult to apply internal security with ACLs to stop certain addresses accessing specified areas of the network with everyone on the same subnet?

Thanks you

References: Animated marketing video

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